Add method to cound number of subscription

Update SSL Certificate for ESP8266, add warning

.github/workflows/githubci.yml

@@ -0,0 +1,26 @@
+name: Arduino Library CI
+
+on: [pull_request, push, repository_dispatch]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.x'
+    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2
+      with:
+         repository: adafruit/ci-arduino
+         path: ci
+
+    - name: pre-install
+      run: bash ci/actions_install.sh
+
+    - name: test platforms
+      run: python3 ci/build_platform.py esp8266 zero
+
+    - name: clang
+      run: python3 ci/run-clang-format.py -e "ci/*" -e "bin/*" -r . 

.travis.yml

@@ -1,12 +0,0 @@
-language: c
-sudo: false
-before_install:
-  - source <(curl -SLs https://raw.githubusercontent.com/adafruit/travis-ci-arduino/master/install.sh)
-install:
-  - arduino --install-library "Adafruit SleepyDog Library,Adafruit FONA Library,Adafruit CC3000 Library,Adafruit_WINC1500"
-script:
-  - build_main_platforms
-notifications:
-  email:
-    on_success: change
-    on_failure: change

Adafruit_MQTT.cpp

@@ -9,8 +9,8 @@
 // copies of the Software, and to permit persons to whom the Software is
 // furnished to do so, subject to the following conditions:
 //
-// The above copyright notice and this permission notice shall be included in all
-// copies or substantial portions of the Software.
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
 //
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
@@ -21,8 +21,10 @@
 // SOFTWARE.
 #include "Adafruit_MQTT.h"
 
-#if defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_SAMD_MKR1000)
-static char *dtostrf (double val, signed char width, unsigned char prec, char *sout) {
+#if defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_SAMD_MKR1000) ||             \
+    defined(ARDUINO_SAMD_MKR1010) || defined(ARDUINO_ARCH_SAMD)
+static char *dtostrf(double val, signed char width, unsigned char prec,
+                     char *sout) {
   char fmt[20];
   sprintf(fmt, "%%%d.%df", width, prec);
   sprintf(sout, fmt, val);
@@ -31,12 +33,12 @@ static char *dtostrf (double val, signed char width, unsigned char prec, char *s
 #endif
 
 #if defined(ESP8266)
-int strncasecmp(const char * str1, const char * str2, int len) {
+int strncasecmp(const char *str1, const char *str2, int len) {
   int d = 0;
-    while(len--) {
+  while (len--) {
     int c1 = tolower(*str1++);
     int c2 = tolower(*str2++);
-        if(((d = c1 - c2) != 0) || (c2 == '\0')) {
+    if (((d = c1 - c2) != 0) || (c2 == '\0')) {
       return d;
     }
   }
@@ -44,10 +46,9 @@ int strncasecmp(const char * str1, const char * str2, int len) {
 }
 #endif
 
-
 void printBuffer(uint8_t *buffer, uint16_t len) {
   DEBUG_PRINTER.print('\t');
-  for (uint16_t i=0; i<len; i++) {
+  for (uint16_t i = 0; i < len; i++) {
     if (isprint(buffer[i]))
       DEBUG_PRINTER.write(buffer[i]);
     else
@@ -55,7 +56,7 @@ void printBuffer(uint8_t *buffer, uint16_t len) {
     DEBUG_PRINTER.print(F(" [0x"));
     if (buffer[i] < 0x10)
       DEBUG_PRINTER.print("0");
-    DEBUG_PRINTER.print(buffer[i],HEX);
+    DEBUG_PRINTER.print(buffer[i], HEX);
     DEBUG_PRINTER.print("], ");
     if (i % 8 == 7) {
       DEBUG_PRINTER.print("\n\t");
@@ -74,7 +75,7 @@ static uint8_t *stringprint(uint8_t *p, char *s) {
 }
 */
 
-static uint8_t *stringprint(uint8_t *p, const char *s, uint16_t maxlen=0) {
+static uint8_t *stringprint(uint8_t *p, const char *s, uint16_t maxlen = 0) {
   // If maxlen is specified (has a non-zero value) then use it as the maximum
   // length of the source string to write to the buffer.  Otherwise write
   // the entire source string.
@@ -87,20 +88,34 @@ static uint8_t *stringprint(uint8_t *p, const char *s, uint16_t maxlen=0) {
     Serial.write(pgm_read_byte(s+i));
   }
   */
-  p[0] = len >> 8; p++;
-  p[0] = len & 0xFF; p++;
+  p[0] = len >> 8;
+  p++;
+  p[0] = len & 0xFF;
+  p++;
   strncpy((char *)p, s, len);
-  return p+len;
+  return p + len;
 }
 
+// packetAdditionalLen is a helper function used to figure out
+// how bigger the payload needs to be in order to account for
+// its variable length field. As per
+// http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Table_2.4_Size
+// See also readFullPacket
+static uint16_t packetAdditionalLen(uint32_t currLen) {
+  /* Increase length field based on current length */
+  if (currLen < 128) // 7-bits
+    return 0;
+  if (currLen < 16384) // 14-bits
+    return 1;
+  if (currLen < 2097152) // 21-bits
+    return 2;
+  return 3;
+}
 
 // Adafruit_MQTT Definition ////////////////////////////////////////////////////
 
-Adafruit_MQTT::Adafruit_MQTT(const char *server,
-                             uint16_t port,
-                             const char *cid,
-                             const char *user,
-                             const char *pass) {
+Adafruit_MQTT::Adafruit_MQTT(const char *server, uint16_t port, const char *cid,
+                             const char *user, const char *pass) {
   servername = server;
   portnum = port;
   clientid = cid;
@@ -108,7 +123,7 @@ Adafruit_MQTT::Adafruit_MQTT(const char *server,
   password = pass;
 
   // reset subscriptions
-  for (uint8_t i=0; i<MAXSUBSCRIPTIONS; i++) {
+  for (uint8_t i = 0; i < MAXSUBSCRIPTIONS; i++) {
     subscriptions[i] = 0;
   }
 
@@ -117,15 +132,13 @@ Adafruit_MQTT::Adafruit_MQTT(const char *server,
   will_qos = 0;
   will_retain = 0;
 
-  packet_id_counter = 0;
+  keepAliveInterval = MQTT_CONN_KEEPALIVE;
 
+  packet_id_counter = 0;
 }
 
-
-Adafruit_MQTT::Adafruit_MQTT(const char *server,
-                             uint16_t port,
-                             const char *user,
-                             const char *pass) {
+Adafruit_MQTT::Adafruit_MQTT(const char *server, uint16_t port,
+                             const char *user, const char *pass) {
   servername = server;
   portnum = port;
   clientid = "";
@@ -133,7 +146,7 @@ Adafruit_MQTT::Adafruit_MQTT(const char *server,
   password = pass;
 
   // reset subscriptions
-  for (uint8_t i=0; i<MAXSUBSCRIPTIONS; i++) {
+  for (uint8_t i = 0; i < MAXSUBSCRIPTIONS; i++) {
     subscriptions[i] = 0;
   }
 
@@ -142,8 +155,9 @@ Adafruit_MQTT::Adafruit_MQTT(const char *server,
   will_qos = 0;
   will_retain = 0;
 
-  packet_id_counter = 0;
+  keepAliveInterval = MQTT_CONN_KEEPALIVE;
 
+  packet_id_counter = 0;
 }
 
 int8_t Adafruit_MQTT::connect() {
@@ -158,80 +172,96 @@ int8_t Adafruit_MQTT::connect() {
 
   // Read connect response packet and verify it
   len = readFullPacket(buffer, MAXBUFFERSIZE, CONNECT_TIMEOUT_MS);
-  if (len != 4)
+  if (len != 4) {
     return -1;
-  if ((buffer[0] != (MQTT_CTRL_CONNECTACK << 4)) || (buffer[1] != 2))
+  }
+  if ((buffer[0] != (MQTT_CTRL_CONNECTACK << 4)) || (buffer[1] != 2)) {
     return -1;
+  }
   if (buffer[3] != 0)
     return buffer[3];
 
   // Setup subscriptions once connected.
-  for (uint8_t i=0; i<MAXSUBSCRIPTIONS; i++) {
+  for (uint8_t i = 0; i < MAXSUBSCRIPTIONS; i++) {
     // Ignore subscriptions that aren't defined.
-    if (subscriptions[i] == 0) continue;
+    if (subscriptions[i] == 0)
+      continue;
 
     boolean success = false;
-    for (uint8_t retry=0; (retry<3) && !success; retry++) { // retry until we get a suback    
+    for (uint8_t retry = 0; (retry < 3) && !success;
+         retry++) { // retry until we get a suback
       // Construct and send subscription packet.
-      uint8_t len = subscribePacket(buffer, subscriptions[i]->topic, subscriptions[i]->qos);
+      uint8_t len = subscribePacket(buffer, subscriptions[i]->topic,
+                                    subscriptions[i]->qos);
       if (!sendPacket(buffer, len))
         return -1;
 
-      if(MQTT_PROTOCOL_LEVEL < 3) // older versions didn't suback
+      if (MQTT_PROTOCOL_LEVEL < 3) // older versions didn't suback
         break;
 
       // Check for SUBACK if using MQTT 3.1.1 or higher
-      // TODO: The Server is permitted to start sending PUBLISH packets matching the
-      // Subscription before the Server sends the SUBACK Packet. (will really need to use callbacks - ada)
+      // TODO: The Server is permitted to start sending PUBLISH packets matching
+      // the Subscription before the Server sends the SUBACK Packet. (will
+      // really need to use callbacks - ada)
 
-      //Serial.println("\t**looking for suback");
       if (processPacketsUntil(buffer, MQTT_CTRL_SUBACK, SUBACK_TIMEOUT_MS)) {
         success = true;
         break;
       }
-      //Serial.println("\t**failed, retrying!");
     }
-    if (! success) return -2; // failed to sub for some reason
+    if (!success)
+      return -2; // failed to sub for some reason
   }
 
   return 0;
 }
 
-int8_t Adafruit_MQTT::connect(const char *user, const char *pass)
-{
+int8_t Adafruit_MQTT::connect(const char *user, const char *pass) {
   username = user;
   password = pass;
   return connect();
 }
 
-uint16_t Adafruit_MQTT::processPacketsUntil(uint8_t *buffer, uint8_t waitforpackettype, uint16_t timeout) {
+uint16_t Adafruit_MQTT::processPacketsUntil(uint8_t *buffer,
+                                            uint8_t waitforpackettype,
+                                            uint16_t timeout) {
   uint16_t len;
-  while (len = readFullPacket(buffer, MAXBUFFERSIZE, timeout)) {
 
-    //DEBUG_PRINT("Packet read size: "); DEBUG_PRINTLN(len);
-    // TODO: add subscription reading & call back processing here
+  while (true) {
+    len = readFullPacket(buffer, MAXBUFFERSIZE, timeout);
 
-    if ((buffer[0] >> 4) == waitforpackettype) {
-      //DEBUG_PRINTLN(F("Found right packet")); 
+    if (len == 0) {
+      break;
+    }
+
+    uint8_t packetType = (buffer[0] >> 4);
+    if (packetType == waitforpackettype) {
       return len;
+    } else {
+      if (packetType == MQTT_CTRL_PUBLISH) {
+        handleSubscriptionPacket(len);
       } else {
         ERROR_PRINTLN(F("Dropped a packet"));
       }
     }
+  }
   return 0;
 }
 
-uint16_t Adafruit_MQTT::readFullPacket(uint8_t *buffer, uint16_t maxsize, uint16_t timeout) {
+uint16_t Adafruit_MQTT::readFullPacket(uint8_t *buffer, uint16_t maxsize,
+                                       uint16_t timeout) {
   // will read a packet and Do The Right Thing with length
   uint8_t *pbuff = buffer;
 
-  uint8_t rlen;
+  uint16_t rlen;
 
   // read the packet type:
   rlen = readPacket(pbuff, 1, timeout);
-  if (rlen != 1) return 0;
+  if (rlen != 1)
+    return 0;
 
-  DEBUG_PRINT(F("Packet Type:\t")); DEBUG_PRINTBUFFER(pbuff, rlen);
+  DEBUG_PRINT(F("Packet Type:\t"));
+  DEBUG_PRINTBUFFER(pbuff, rlen);
   pbuff++;
 
   uint32_t value = 0;
@@ -240,44 +270,60 @@ uint16_t Adafruit_MQTT::readFullPacket(uint8_t *buffer, uint16_t maxsize, uint16
 
   do {
     rlen = readPacket(pbuff, 1, timeout);
-    if (rlen != 1) return 0;
+    if (rlen != 1)
+      return 0;
     encodedByte = pbuff[0]; // save the last read val
     pbuff++;                // get ready for reading the next byte
     uint32_t intermediate = encodedByte & 0x7F;
     intermediate *= multiplier;
     value += intermediate;
     multiplier *= 128;
-    if (multiplier > (128UL*128UL*128UL)) {
+    if (multiplier > (128UL * 128UL * 128UL)) {
       DEBUG_PRINT(F("Malformed packet len\n"));
       return 0;
     }
   } while (encodedByte & 0x80);
 
-  DEBUG_PRINT(F("Packet Length:\t")); DEBUG_PRINTLN(value);
+  DEBUG_PRINT(F("Packet Length:\t"));
+  DEBUG_PRINTLN(value);
 
-  if (value > (maxsize - (pbuff-buffer) - 1)) {
+  // maxsize is limited to 65536 by 16-bit unsigned
+  if (value > uint32_t(maxsize - (pbuff - buffer) - 1)) {
     DEBUG_PRINTLN(F("Packet too big for buffer"));
-      rlen = readPacket(pbuff, (maxsize - (pbuff-buffer) - 1), timeout);
+    rlen = readPacket(pbuff, (maxsize - (pbuff - buffer) - 1), timeout);
   } else {
     rlen = readPacket(pbuff, value, timeout);
   }
-  //DEBUG_PRINT(F("Remaining packet:\t")); DEBUG_PRINTBUFFER(pbuff, rlen);
+  // DEBUG_PRINT(F("Remaining packet:\t")); DEBUG_PRINTBUFFER(pbuff, rlen);
 
-  return ((pbuff - buffer)+rlen);
+  return ((pbuff - buffer) + rlen);
 }
 
-const __FlashStringHelper* Adafruit_MQTT::connectErrorString(int8_t code) {
+const __FlashStringHelper *Adafruit_MQTT::connectErrorString(int8_t code) {
   switch (code) {
-      case 1: return F("The Server does not support the level of the MQTT protocol requested");
-      case 2: return F("The Client identifier is correct UTF-8 but not allowed by the Server");
-      case 3: return F("The MQTT service is unavailable");
-      case 4: return F("The data in the user name or password is malformed");
-      case 5: return F("Not authorized to connect");
-      case 6: return F("Exceeded reconnect rate limit. Please try again later.");
-      case 7: return F("You have been banned from connecting. Please contact the MQTT server administrator for more details.");
-      case -1: return F("Connection failed");
-      case -2: return F("Failed to subscribe");
-      default: return F("Unknown error");
+  case 1:
+    return F(
+        "The Server does not support the level of the MQTT protocol requested");
+  case 2:
+    return F(
+        "The Client identifier is correct UTF-8 but not allowed by the Server");
+  case 3:
+    return F("The MQTT service is unavailable");
+  case 4:
+    return F("The data in the user name or password is malformed");
+  case 5:
+    return F("Not authorized to connect");
+  case 6:
+    return F("Exceeded reconnect rate limit. Please try again later.");
+  case 7:
+    return F("You have been banned from connecting. Please contact the MQTT "
+             "server administrator for more details.");
+  case -1:
+    return F("Connection failed");
+  case -2:
+    return F("Failed to subscribe");
+  default:
+    return F("Unknown error");
   }
 }
 
@@ -285,38 +331,39 @@ bool Adafruit_MQTT::disconnect() {
 
   // Construct and send disconnect packet.
   uint8_t len = disconnectPacket(buffer);
-  if (! sendPacket(buffer, len))
+  if (!sendPacket(buffer, len))
     DEBUG_PRINTLN(F("Unable to send disconnect packet"));
 
   return disconnectServer();
-
 }
 
-
-bool Adafruit_MQTT::publish(const char *topic, const char *data, uint8_t qos) {
-    return publish(topic, (uint8_t*)(data), strlen(data), qos);
+bool Adafruit_MQTT::publish(const char *topic, const char *data, uint8_t qos, uint8_t retain) {
+  return publish(topic, (uint8_t *)(data), strlen(data), qos, retain);
 }
 
-bool Adafruit_MQTT::publish(const char *topic, uint8_t *data, uint16_t bLen, uint8_t qos) {
+bool Adafruit_MQTT::publish(const char *topic, uint8_t *data, uint16_t bLen,
+                            uint8_t qos, uint8_t retain) {
   // Construct and send publish packet.
-  uint16_t len = publishPacket(buffer, topic, data, bLen, qos);
+  uint16_t len =
+      publishPacket(buffer, topic, data, bLen, qos, (uint16_t)sizeof(buffer), retain);
   if (!sendPacket(buffer, len))
     return false;
 
   // If QOS level is high enough verify the response packet.
   if (qos > 0) {
-    len = readFullPacket(buffer, MAXBUFFERSIZE, PUBLISH_TIMEOUT_MS);
+    len = processPacketsUntil(buffer, MQTT_CTRL_PUBACK, PUBLISH_TIMEOUT_MS);
+
     DEBUG_PRINT(F("Publish QOS1+ reply:\t"));
     DEBUG_PRINTBUFFER(buffer, len);
     if (len != 4)
       return false;
-    if ((buffer[0] >> 4) != MQTT_CTRL_PUBACK)
-      return false;
+
     uint16_t packnum = buffer[2];
     packnum <<= 8;
     packnum |= buffer[3];
 
-    // we increment the packet_id_counter right after publishing so inc here too to match
+    // we increment the packet_id_counter right after publishing so inc here too
+    // to match
     packnum++;
     if (packnum != packet_id_counter)
       return false;
@@ -325,7 +372,8 @@ bool Adafruit_MQTT::publish(const char *topic, uint8_t *data, uint16_t bLen, uin
   return true;
 }
 
-bool Adafruit_MQTT::will(const char *topic, const char *payload, uint8_t qos, uint8_t retain) {
+bool Adafruit_MQTT::will(const char *topic, const char *payload, uint8_t qos,
+                         uint8_t retain) {
 
   if (connected()) {
     DEBUG_PRINT(F("Will defined after connect"));
@@ -338,22 +386,41 @@ bool Adafruit_MQTT::will(const char *topic, const char *payload, uint8_t qos, ui
   will_retain = retain;
 
   return true;
+}
 
+/***************************************************************************/
+/*!
+    @brief  Sets the connect packet's KeepAlive Interval, in seconds. This
+            function MUST be called prior to connect().
+    @param    keepAlive
+               Maximum amount of time without communication between the
+               client and the MQTT broker, in seconds.
+    @returns  True if called prior to connect(), False otherwise.
+*/
+/***************************************************************************/
+bool Adafruit_MQTT::setKeepAliveInterval(uint16_t keepAlive) {
+  if (connected()) {
+    DEBUG_PRINT(F("keepAlive defined after connection established."));
+    return false;
+  }
+  keepAliveInterval = keepAlive;
+  return true;
 }
 
 bool Adafruit_MQTT::subscribe(Adafruit_MQTT_Subscribe *sub) {
   uint8_t i;
   // see if we are already subscribed
-  for (i=0; i<MAXSUBSCRIPTIONS; i++) {
+  for (i = 0; i < MAXSUBSCRIPTIONS; i++) {
     if (subscriptions[i] == sub) {
       DEBUG_PRINTLN(F("Already subscribed"));
       return true;
     }
   }
-  if (i==MAXSUBSCRIPTIONS) { // add to subscriptionlist
-    for (i=0; i<MAXSUBSCRIPTIONS; i++) {
+  if (i == MAXSUBSCRIPTIONS) { // add to subscriptionlist
+    for (i = 0; i < MAXSUBSCRIPTIONS; i++) {
       if (subscriptions[i] == 0) {
-        DEBUG_PRINT(F("Added sub ")); DEBUG_PRINTLN(i);
+        DEBUG_PRINT(F("Added sub "));
+        DEBUG_PRINTLN(i);
         subscriptions[i] = sub;
         return true;
       }
@@ -368,22 +435,23 @@ bool Adafruit_MQTT::unsubscribe(Adafruit_MQTT_Subscribe *sub) {
   uint8_t i;
 
   // see if we are already subscribed
-  for (i=0; i<MAXSUBSCRIPTIONS; i++) {
+  for (i = 0; i < MAXSUBSCRIPTIONS; i++) {
 
     if (subscriptions[i] == sub) {
 
-      DEBUG_PRINTLN(F("Found matching subscription and attempting to unsubscribe."));
+      DEBUG_PRINTLN(
+          F("Found matching subscription and attempting to unsubscribe."));
 
       // Construct and send unsubscribe packet.
       uint8_t len = unsubscribePacket(buffer, subscriptions[i]->topic);
 
       // sending unsubscribe failed
-      if (! sendPacket(buffer, len))
+      if (!sendPacket(buffer, len))
         return false;
 
       // if QoS for this subscription is 1 or 2, we need
       // to wait for the unsuback to confirm unsubscription
-      if(subscriptions[i]->qos > 0 && MQTT_PROTOCOL_LEVEL > 3) {
+      if (subscriptions[i]->qos > 0 && MQTT_PROTOCOL_LEVEL > 3) {
 
         // wait for UNSUBACK
         len = readFullPacket(buffer, MAXBUFFERSIZE, CONNECT_TIMEOUT_MS);
@@ -398,46 +466,36 @@ bool Adafruit_MQTT::unsubscribe(Adafruit_MQTT_Subscribe *sub) {
       subscriptions[i] = 0;
       return true;
     }
-
   }
 
   // subscription not found, so we are unsubscribed
   return true;
-
 }
 
 void Adafruit_MQTT::processPackets(int16_t timeout) {
-  uint16_t len;
 
   uint32_t elapsed = 0, endtime, starttime = millis();
 
   while (elapsed < (uint32_t)timeout) {
     Adafruit_MQTT_Subscribe *sub = readSubscription(timeout - elapsed);
     if (sub) {
-      //Serial.println("**** sub packet received");
       if (sub->callback_uint32t != NULL) {
         // huh lets do the callback in integer mode
         uint32_t data = 0;
         data = atoi((char *)sub->lastread);
-	//Serial.print("*** calling int callback with : "); Serial.println(data);
         sub->callback_uint32t(data);
-      } 
-      else if (sub->callback_double != NULL) {
+      } else if (sub->callback_double != NULL) {
         // huh lets do the callback in doublefloat mode
         double data = 0;
         data = atof((char *)sub->lastread);
-	//Serial.print("*** calling double callback with : "); Serial.println(data);
         sub->callback_double(data);
-      }
-      else if (sub->callback_buffer != NULL) {
+      } else if (sub->callback_buffer != NULL) {
         // huh lets do the callback in buffer mode
-	//Serial.print("*** calling buffer callback with : "); Serial.println((char *)sub->lastread);
         sub->callback_buffer((char *)sub->lastread, sub->datalen);
-      }
-      else if (sub->callback_io != NULL) {
+      } else if (sub->callback_io != NULL) {
         // huh lets do the callback in io mode
-        //Serial.print("*** calling io instance callback with : "); Serial.println((char *)sub->lastread);
-        ((sub->io_mqtt)->*(sub->callback_io))((char *)sub->lastread, sub->datalen);
+        ((sub->io_mqtt)->*(sub->callback_io))((char *)sub->lastread,
+                                              sub->datalen);
       }
     }
 
@@ -449,23 +507,61 @@ void Adafruit_MQTT::processPackets(int16_t timeout) {
     elapsed += (endtime - starttime);
   }
 }
-
 Adafruit_MQTT_Subscribe *Adafruit_MQTT::readSubscription(int16_t timeout) {
+
+  // Sync or Async subscriber with message
+  Adafruit_MQTT_Subscribe *s = 0;
+
+  // Check if are unread messages
+  for (uint8_t i = 0; i < MAXSUBSCRIPTIONS; i++) {
+    if (subscriptions[i] && subscriptions[i]->new_message) {
+      s = subscriptions[i];
+      break;
+    }
+  }
+
+  // not unread message
+  if (!s) {
+    // Check if data is available to read.
+    uint16_t len = readFullPacket(buffer, MAXBUFFERSIZE,
+                                  timeout); // return one full packet
+    s = handleSubscriptionPacket(len);
+  }
+
+  // it there is a message, mark it as not pending
+  if (s) {
+    s->new_message = false;
+  }
+
+  return s;
+}
+
+Adafruit_MQTT_Subscribe *Adafruit_MQTT::handleSubscriptionPacket(uint16_t len) {
   uint16_t i, topiclen, datalen;
 
-  // Check if data is available to read.
-  uint16_t len = readFullPacket(buffer, MAXBUFFERSIZE, timeout); // return one full packet
-  if (!len)
+  if (!len) {
     return NULL; // No data available, just quit.
-  DEBUG_PRINT("Packet len: "); DEBUG_PRINTLN(len); 
+  }
+  DEBUG_PRINT("Packet len: ");
+  DEBUG_PRINTLN(len);
   DEBUG_PRINTBUFFER(buffer, len);
 
+  if (len < 3) {
+    return NULL;
+  }
+  if ((buffer[0] & 0xF0) != (MQTT_CTRL_PUBLISH) << 4) {
+    return NULL;
+  }
+
   // Parse out length of packet.
-  topiclen = buffer[3];
-  DEBUG_PRINT(F("Looking for subscription len ")); DEBUG_PRINTLN(topiclen);
+  uint16_t const topicoffset = packetAdditionalLen(len);
+  uint16_t const topicstart = topicoffset + 4;
+  topiclen = buffer[3 + topicoffset];
+  DEBUG_PRINT(F("Looking for subscription len "));
+  DEBUG_PRINTLN(topiclen);
 
   // Find subscription associated with this packet.
-  for (i=0; i<MAXSUBSCRIPTIONS; i++) {
+  for (i = 0; i < MAXSUBSCRIPTIONS; i++) {
     if (subscriptions[i]) {
       // Skip this subscription if its name length isn't the same as the
       // received topic name.
@@ -473,38 +569,50 @@ Adafruit_MQTT_Subscribe *Adafruit_MQTT::readSubscription(int16_t timeout) {
         continue;
       // Stop if the subscription topic matches the received topic. Be careful
       // to make comparison case insensitive.
-      if (strncasecmp((char*)buffer+4, subscriptions[i]->topic, topiclen) == 0) {
-        DEBUG_PRINT(F("Found sub #")); DEBUG_PRINTLN(i);
+      if (strncasecmp((char *)buffer + topicstart, subscriptions[i]->topic,
+                      topiclen) == 0) {
+        DEBUG_PRINT(F("Found sub #"));
+        DEBUG_PRINTLN(i);
+        if (subscriptions[i]->new_message) {
+          DEBUG_PRINTLN(F("Lost previous message"));
+        } else {
+          subscriptions[i]->new_message = true;
+        }
+
         break;
       }
     }
   }
-  if (i==MAXSUBSCRIPTIONS) return NULL; // matching sub not found ???
+  if (i == MAXSUBSCRIPTIONS)
+    return NULL; // matching sub not found ???
 
   uint8_t packet_id_len = 0;
-  uint16_t packetid;
+  uint16_t packetid = 0;
   // Check if it is QoS 1, TODO: we dont support QoS 2
   if ((buffer[0] & 0x6) == 0x2) {
     packet_id_len = 2;
-    packetid = buffer[topiclen+4];
+    packetid = buffer[topiclen + topicstart];
     packetid <<= 8;
-    packetid |= buffer[topiclen+5];
+    packetid |= buffer[topiclen + topicstart + 1];
   }
 
   // zero out the old data
   memset(subscriptions[i]->lastread, 0, SUBSCRIPTIONDATALEN);
 
-  datalen = len - topiclen - packet_id_len - 4;
+  datalen = len - topiclen - packet_id_len - topicstart;
   if (datalen > SUBSCRIPTIONDATALEN) {
-    datalen = SUBSCRIPTIONDATALEN-1; // cut it off
+    datalen = SUBSCRIPTIONDATALEN - 1; // cut it off
   }
   // extract out just the data, into the subscription object itself
-  memmove(subscriptions[i]->lastread, buffer+4+topiclen+packet_id_len, datalen);
+  memmove(subscriptions[i]->lastread,
+          buffer + topicstart + topiclen + packet_id_len, datalen);
   subscriptions[i]->datalen = datalen;
-  DEBUG_PRINT(F("Data len: ")); DEBUG_PRINTLN(datalen);
-  DEBUG_PRINT(F("Data: ")); DEBUG_PRINTLN((char *)subscriptions[i]->lastread);
+  DEBUG_PRINT(F("Data len: "));
+  DEBUG_PRINTLN(datalen);
+  DEBUG_PRINT(F("Data: "));
+  DEBUG_PRINTLN((char *)subscriptions[i]->lastread);
 
-  if ((MQTT_PROTOCOL_LEVEL > 3) &&(buffer[0] & 0x6) == 0x2) {
+  if ((MQTT_PROTOCOL_LEVEL > 3) && (buffer[0] & 0x6) == 0x2) {
     uint8_t ackpacket[4];
 
     // Construct and send puback packet.
@@ -520,11 +628,12 @@ Adafruit_MQTT_Subscribe *Adafruit_MQTT::readSubscription(int16_t timeout) {
 void Adafruit_MQTT::flushIncoming(uint16_t timeout) {
   // flush input!
   DEBUG_PRINTLN(F("Flushing input buffer"));
-  while (readPacket(buffer, MAXBUFFERSIZE, timeout));
+  while (readPacket(buffer, MAXBUFFERSIZE, timeout))
+    ;
 }
 
 bool Adafruit_MQTT::ping(uint8_t num) {
-  //flushIncoming(100);
+  // flushIncoming(100);
 
   while (num--) {
     // Construct and send ping packet.
@@ -554,7 +663,7 @@ uint8_t Adafruit_MQTT::connectPacket(uint8_t *packet) {
 
   // fixed header, connection messsage no flags
   p[0] = (MQTT_CTRL_CONNECT << 4) | 0x0;
-  p+=2;
+  p += 2;
   // fill in packet[1] last
 
 #if MQTT_PROTOCOL_LEVEL == 3
@@ -562,7 +671,7 @@ uint8_t Adafruit_MQTT::connectPacket(uint8_t *packet) {
 #elif MQTT_PROTOCOL_LEVEL == 4
   p = stringprint(p, "MQTT");
 #else
-    #error "MQTT level not supported"
+#error "MQTT level not supported"
 #endif
 
   p[0] = MQTT_PROTOCOL_LEVEL;
@@ -576,14 +685,13 @@ uint8_t Adafruit_MQTT::connectPacket(uint8_t *packet) {
 
     p[0] |= MQTT_CONN_WILLFLAG;
 
-    if(will_qos == 1)
+    if (will_qos == 1)
       p[0] |= MQTT_CONN_WILLQOS_1;
-    else if(will_qos == 2)
+    else if (will_qos == 2)
       p[0] |= MQTT_CONN_WILLQOS_2;
 
-    if(will_retain == 1)
+    if (will_retain == 1)
       p[0] |= MQTT_CONN_WILLRETAIN;
-
   }
 
   if (pgm_read_byte(username) != 0)
@@ -592,12 +700,12 @@ uint8_t Adafruit_MQTT::connectPacket(uint8_t *packet) {
     p[0] |= MQTT_CONN_PASSWORDFLAG;
   p++;
 
-  p[0] = MQTT_CONN_KEEPALIVE >> 8;
+  p[0] = keepAliveInterval >> 8;
   p++;
-  p[0] = MQTT_CONN_KEEPALIVE & 0xFF;
+  p[0] = keepAliveInterval & 0xFF;
   p++;
 
-  if(MQTT_PROTOCOL_LEVEL == 3) {
+  if (MQTT_PROTOCOL_LEVEL == 3) {
     p = stringprint(p, clientid, 23); // Limit client ID to first 23 characters.
   } else {
     if (pgm_read_byte(clientid) != 0) {
@@ -625,29 +733,47 @@ uint8_t Adafruit_MQTT::connectPacket(uint8_t *packet) {
 
   len = p - packet;
 
-  packet[1] = len-2;  // don't include the 2 bytes of fixed header data
+  packet[1] = len - 2; // don't include the 2 bytes of fixed header data
   DEBUG_PRINTLN(F("MQTT connect packet:"));
   DEBUG_PRINTBUFFER(buffer, len);
   return len;
 }
 
-
-// as per http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718040
+// as per
+// http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718040
 uint16_t Adafruit_MQTT::publishPacket(uint8_t *packet, const char *topic,
-                                     uint8_t *data, uint16_t bLen, uint8_t qos) {
+                                      uint8_t *data, uint16_t bLen, uint8_t qos,
+                                      uint16_t maxPacketLen, uint8_t retain) {
   uint8_t *p = packet;
-  uint16_t len=0;
+  uint16_t len = 0;
 
   // calc length of non-header data
   len += 2;             // two bytes to set the topic size
   len += strlen(topic); // topic length
-  if(qos > 0) { 
+  if (qos > 0) {
     len += 2; // qos packet id
   }
-  len += bLen; // payload length
+  // Calculate additional bytes for length field (if any)
+  uint16_t additionalLen = packetAdditionalLen(len + bLen);
+
+  // Payload remaining length. When maxPacketLen provided is 0, let's
+  // assume buffer is big enough. Fingers crossed.
+  // 2 + additionalLen: header byte + remaining length field (from 1 to 4 bytes)
+  // len = topic size field + value (string)
+  // bLen = buffer size
+  if (!(maxPacketLen == 0 ||
+        (len + bLen + 2 + additionalLen <= maxPacketLen))) {
+    // If we make it here, we got a pickle: the payload is not going
+    // to fit in the packet buffer. Instead of corrupting memory, let's
+    // do something less damaging by reducing the bLen to what we are
+    // able to accomodate. Alternatively, consider using a bigger
+    // maxPacketLen.
+    bLen = maxPacketLen - (len + 2 + packetAdditionalLen(maxPacketLen));
+  }
+  len += bLen; // remaining len excludes header byte & length field
 
   // Now you can start generating the packet!
-  p[0] = MQTT_CTRL_PUBLISH << 4 | qos << 1;
+  p[0] = MQTT_CTRL_PUBLISH << 4 | qos << 1 | (retain ? 1 : 0);
   p++;
 
   // fill in packet[1] last
@@ -655,28 +781,28 @@ uint16_t Adafruit_MQTT::publishPacket(uint8_t *packet, const char *topic,
     uint8_t encodedByte = len % 128;
     len /= 128;
     // if there are more data to encode, set the top bit of this byte
-    if ( len > 0 ) {
+    if (len > 0) {
       encodedByte |= 0x80;
     }
     p[0] = encodedByte;
     p++;
-  } while ( len > 0 );
+  } while (len > 0);
 
   // topic comes before packet identifier
   p = stringprint(p, topic);
 
   // add packet identifier. used for checking PUBACK in QOS > 0
-  if(qos > 0) {
+  if (qos > 0) {
     p[0] = (packet_id_counter >> 8) & 0xFF;
     p[1] = packet_id_counter & 0xFF;
-    p+=2;
+    p += 2;
 
     // increment the packet id
     packet_id_counter++;
   }
 
   memmove(p, data, bLen);
-  p+= bLen;
+  p += bLen;
   len = p - packet;
   DEBUG_PRINTLN(F("MQTT publish packet:"));
   DEBUG_PRINTBUFFER(buffer, len);
@@ -690,12 +816,12 @@ uint8_t Adafruit_MQTT::subscribePacket(uint8_t *packet, const char *topic,
 
   p[0] = MQTT_CTRL_SUBSCRIBE << 4 | MQTT_QOS_1 << 1;
   // fill in packet[1] last
-  p+=2;
+  p += 2;
 
   // packet identifier. used for checking SUBACK
   p[0] = (packet_id_counter >> 8) & 0xFF;
   p[1] = packet_id_counter & 0xFF;
-  p+=2;
+  p += 2;
 
   // increment the packet id
   packet_id_counter++;
@@ -706,14 +832,12 @@ uint8_t Adafruit_MQTT::subscribePacket(uint8_t *packet, const char *topic,
   p++;
 
   len = p - packet;
-  packet[1] = len-2; // don't include the 2 bytes of fixed header data
+  packet[1] = len - 2; // don't include the 2 bytes of fixed header data
   DEBUG_PRINTLN(F("MQTT subscription packet:"));
   DEBUG_PRINTBUFFER(buffer, len);
   return len;
 }
 
-
-
 uint8_t Adafruit_MQTT::unsubscribePacket(uint8_t *packet, const char *topic) {
 
   uint8_t *p = packet;
@@ -721,12 +845,12 @@ uint8_t Adafruit_MQTT::unsubscribePacket(uint8_t *packet, const char *topic) {
 
   p[0] = MQTT_CTRL_UNSUBSCRIBE << 4 | 0x1;
   // fill in packet[1] last
-  p+=2;
+  p += 2;
 
   // packet identifier. used for checking UNSUBACK
   p[0] = (packet_id_counter >> 8) & 0xFF;
   p[1] = packet_id_counter & 0xFF;
-  p+=2;
+  p += 2;
 
   // increment the packet id
   packet_id_counter++;
@@ -734,11 +858,10 @@ uint8_t Adafruit_MQTT::unsubscribePacket(uint8_t *packet, const char *topic) {
   p = stringprint(p, topic);
 
   len = p - packet;
-  packet[1] = len-2; // don't include the 2 bytes of fixed header data
+  packet[1] = len - 2; // don't include the 2 bytes of fixed header data
   DEBUG_PRINTLN(F("MQTT unsubscription packet:"));
   DEBUG_PRINTBUFFER(buffer, len);
   return len;
-
 }
 
 uint8_t Adafruit_MQTT::pingPacket(uint8_t *packet) {
@@ -767,43 +890,56 @@ uint8_t Adafruit_MQTT::disconnectPacket(uint8_t *packet) {
   return 2;
 }
 
+uint Adafruit_MQTT::getSubscriptionCount()
+{
+  uint count = 0;
+
+  for (int i = 0; i < MAXSUBSCRIPTIONS; i++) {
+    if (subscriptions[i])
+      count++;
+  }
+
+  return count;
+}
+
 // Adafruit_MQTT_Publish Definition ////////////////////////////////////////////
 
 Adafruit_MQTT_Publish::Adafruit_MQTT_Publish(Adafruit_MQTT *mqttserver,
-                                             const char *feed, uint8_t q) {
+                                             const char *feed, uint8_t q, uint8_t r) {
   mqtt = mqttserver;
   topic = feed;
   qos = q;
+  retain = r;
 }
 bool Adafruit_MQTT_Publish::publish(int32_t i) {
   char payload[12];
   ltoa(i, payload, 10);
-  return mqtt->publish(topic, payload, qos);
+  return mqtt->publish(topic, payload, qos, retain);
 }
 
 bool Adafruit_MQTT_Publish::publish(uint32_t i) {
   char payload[11];
   ultoa(i, payload, 10);
-  return mqtt->publish(topic, payload, qos);
+  return mqtt->publish(topic, payload, qos, retain);
 }
 
 bool Adafruit_MQTT_Publish::publish(double f, uint8_t precision) {
-  char payload[41];  // Need to technically hold float max, 39 digits and minus sign.
+  char payload[41]; // Need to technically hold float max, 39 digits and minus
+                    // sign.
   dtostrf(f, 0, precision, payload);
-  return mqtt->publish(topic, payload, qos);
+  return mqtt->publish(topic, payload, qos, retain);
 }
 
 bool Adafruit_MQTT_Publish::publish(const char *payload) {
-  return mqtt->publish(topic, payload, qos);
+  return mqtt->publish(topic, payload, qos, retain);
 }
 
-//publish buffer of arbitrary length
+// publish buffer of arbitrary length
 bool Adafruit_MQTT_Publish::publish(uint8_t *payload, uint16_t bLen) {
 
-  return mqtt->publish(topic, payload, bLen, qos);
+  return mqtt->publish(topic, payload, bLen, qos, retain);
 }
 
-
 // Adafruit_MQTT_Subscribe Definition //////////////////////////////////////////
 
 Adafruit_MQTT_Subscribe::Adafruit_MQTT_Subscribe(Adafruit_MQTT *mqttserver,
@@ -817,6 +953,7 @@ Adafruit_MQTT_Subscribe::Adafruit_MQTT_Subscribe(Adafruit_MQTT *mqttserver,
   callback_double = 0;
   callback_io = 0;
   io_mqtt = 0;
+  new_message = false;
 }
 
 void Adafruit_MQTT_Subscribe::setCallback(SubscribeCallbackUInt32Type cb) {
@@ -831,9 +968,10 @@ void Adafruit_MQTT_Subscribe::setCallback(SubscribeCallbackBufferType cb) {
   callback_buffer = cb;
 }
 
-void Adafruit_MQTT_Subscribe::setCallback(AdafruitIO_MQTT *io, SubscribeCallbackIOType cb) {
+void Adafruit_MQTT_Subscribe::setCallback(AdafruitIO_MQTT *io,
+                                          SubscribeCallbackIOType cb) {
   callback_io = cb;
-  io_mqtt= io;
+  io_mqtt = io;
 }
 
 void Adafruit_MQTT_Subscribe::removeCallback(void) {

Adafruit_MQTT.h

@@ -9,8 +9,8 @@
 // copies of the Software, and to permit persons to whom the Software is
 // furnished to do so, subject to the following conditions:
 //
-// The above copyright notice and this permission notice shall be included in all
-// copies or substantial portions of the Software.
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
 //
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
@@ -44,23 +44,35 @@
 
 // Define actual debug output functions when necessary.
 #ifdef MQTT_DEBUG
-  #define DEBUG_PRINT(...) { DEBUG_PRINTER.print(__VA_ARGS__); }
-  #define DEBUG_PRINTLN(...) { DEBUG_PRINTER.println(__VA_ARGS__); }
-  #define DEBUG_PRINTBUFFER(buffer, len) { printBuffer(buffer, len); }
+#define DEBUG_PRINT(...)                                                       \
+  { DEBUG_PRINTER.print(__VA_ARGS__); }
+#define DEBUG_PRINTLN(...)                                                     \
+  { DEBUG_PRINTER.println(__VA_ARGS__); }
+#define DEBUG_PRINTBUFFER(buffer, len)                                         \
+  { printBuffer(buffer, len); }
 #else
-  #define DEBUG_PRINT(...) {}
-  #define DEBUG_PRINTLN(...) {}
-  #define DEBUG_PRINTBUFFER(buffer, len) {}
+#define DEBUG_PRINT(...)                                                       \
+  {}
+#define DEBUG_PRINTLN(...)                                                     \
+  {}
+#define DEBUG_PRINTBUFFER(buffer, len)                                         \
+  {}
 #endif
 
 #ifdef MQTT_ERROR
-  #define ERROR_PRINT(...) { DEBUG_PRINTER.print(__VA_ARGS__); }
-  #define ERROR_PRINTLN(...) { DEBUG_PRINTER.println(__VA_ARGS__); }
-  #define ERROR_PRINTBUFFER(buffer, len) { printBuffer(buffer, len); }
+#define ERROR_PRINT(...)                                                       \
+  { DEBUG_PRINTER.print(__VA_ARGS__); }
+#define ERROR_PRINTLN(...)                                                     \
+  { DEBUG_PRINTER.println(__VA_ARGS__); }
+#define ERROR_PRINTBUFFER(buffer, len)                                         \
+  { printBuffer(buffer, len); }
 #else
-  #define ERROR_PRINT(...) {}
-  #define ERROR_PRINTLN(...) {}
-  #define ERROR_PRINTBUFFER(buffer, len) {}
+#define ERROR_PRINT(...)                                                       \
+  {}
+#define ERROR_PRINTLN(...)                                                     \
+  {}
+#define ERROR_PRINTBUFFER(buffer, len)                                         \
+  {}
 #endif
 
 // Use 3 (MQTT 3.0) or 4 (MQTT 3.1.1)
@@ -105,43 +117,38 @@
 #define MQTT_CONN_WILLFLAG 0x04
 #define MQTT_CONN_CLEANSESSION 0x02
 
-// how many subscriptions we want to be able to track
-#define MAXSUBSCRIPTIONS 5
-
 // how much data we save in a subscription object
-// eg max-subscription-payload-size
-#if defined  (__AVR_ATmega32U4__) || defined(__AVR_ATmega328P__)
-  #define SUBSCRIPTIONDATALEN 20
+// and how many subscriptions we want to be able to track.
+#if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega328P__)
+#define MAXSUBSCRIPTIONS 5
+#define SUBSCRIPTIONDATALEN 20
 #else
-  #define SUBSCRIPTIONDATALEN 100
+#define MAXSUBSCRIPTIONS 15
+#define SUBSCRIPTIONDATALEN 100
 #endif
 
 class AdafruitIO_MQTT; // forward decl
 
-//Function pointer that returns an int
+// Function pointer that returns an int
 typedef void (*SubscribeCallbackUInt32Type)(uint32_t);
 // returns a double
 typedef void (*SubscribeCallbackDoubleType)(double);
 // returns a chunk of raw data
 typedef void (*SubscribeCallbackBufferType)(char *str, uint16_t len);
 // returns an io data wrapper instance
-typedef void (AdafruitIO_MQTT::*SubscribeCallbackIOType)(char *str, uint16_t len);
+typedef void (AdafruitIO_MQTT::*SubscribeCallbackIOType)(char *str,
+                                                         uint16_t len);
 
 extern void printBuffer(uint8_t *buffer, uint16_t len);
 
 class Adafruit_MQTT_Subscribe; // forward decl
 
 class Adafruit_MQTT {
- public:
-  Adafruit_MQTT(const char *server,
-                uint16_t port,
-                const char *cid,
-                const char *user,
-                const char *pass);
+public:
+  Adafruit_MQTT(const char *server, uint16_t port, const char *cid,
+                const char *user, const char *pass);
 
-  Adafruit_MQTT(const char *server,
-                uint16_t port,
-                const char *user = "",
+  Adafruit_MQTT(const char *server, uint16_t port, const char *user = "",
                 const char *pass = "");
   virtual ~Adafruit_MQTT() {}
 
@@ -163,7 +170,7 @@ class Adafruit_MQTT {
   // connect(). This returns a __FlashStringHelper*, which points to a
   // string stored in flash, but can be directly passed to e.g.
   // Serial.println without any further processing.
-  const __FlashStringHelper* connectErrorString(int8_t code);
+  const __FlashStringHelper *connectErrorString(int8_t code);
 
   // Sends MQTT disconnect packet and calls disconnectServer()
   bool disconnect();
@@ -174,12 +181,17 @@ class Adafruit_MQTT {
   // Set MQTT last will topic, payload, QOS, and retain. This needs
   // to be called before connect() because it is sent as part of the
   // connect control packet.
-  bool will(const char *topic, const char *payload, uint8_t qos = 0, uint8_t retain = 0);
+  bool will(const char *topic, const char *payload, uint8_t qos = 0,
+            uint8_t retain = 0);
+
+  // Sets the KeepAlive Interval, in seconds.
+  bool setKeepAliveInterval(uint16_t keepAlive);
 
   // Publish a message to a topic using the specified QoS level.  Returns true
   // if the message was published, false otherwise.
-  bool publish(const char *topic, const char *payload, uint8_t qos = 0);
-  bool publish(const char *topic, uint8_t *payload, uint16_t bLen, uint8_t qos = 0);
+  bool publish(const char *topic, const char *payload, uint8_t qos = 0, uint8_t retain = 0);
+  bool publish(const char *topic, uint8_t *payload, uint16_t bLen,
+               uint8_t qos = 0, uint8_t retain = 0);
 
   // Add a subscription to receive messages for a topic.  Returns true if the
   // subscription could be added or was already present, false otherwise.
@@ -191,23 +203,32 @@ class Adafruit_MQTT {
   bool unsubscribe(Adafruit_MQTT_Subscribe *sub);
 
   // Check if any subscriptions have new messages.  Will return a reference to
-  // an Adafruit_MQTT_Subscribe object which has a new message.  Should be called
-  // in the sketch's loop function to ensure new messages are recevied.  Note
-  // that subscribe should be called first for each topic that receives messages!
-  Adafruit_MQTT_Subscribe *readSubscription(int16_t timeout=0);
+  // an Adafruit_MQTT_Subscribe object which has a new message.  Should be
+  // called in the sketch's loop function to ensure new messages are recevied.
+  // Note that subscribe should be called first for each topic that receives
+  // messages!
+  Adafruit_MQTT_Subscribe *readSubscription(int16_t timeout = 0);
+
+  // Handle any data coming in for subscriptions and fires them off to the
+  // appropriate callback
+  Adafruit_MQTT_Subscribe *handleSubscriptionPacket(uint16_t len);
 
   void processPackets(int16_t timeout);
 
   // Ping the server to ensure the connection is still alive.
   bool ping(uint8_t n = 1);
 
- protected:
+  // Count the number of registrered Adafruit_MQTT_Subscribe
+  uint getSubscriptionCount();
+
+protected:
   // Interface that subclasses need to implement:
 
   // Connect to the server and return true if successful, false otherwise.
   virtual bool connectServer() = 0;
 
-  // Disconnect from the MQTT server.  Returns true if disconnected, false otherwise.
+  // Disconnect from the MQTT server.  Returns true if disconnected, false
+  // otherwise.
   virtual bool disconnectServer() = 0; // Subclasses need to fill this in!
 
   // Send data to the server specified by the buffer and length of data.
@@ -216,12 +237,14 @@ class Adafruit_MQTT {
   // Read MQTT packet from the server.  Will read up to maxlen bytes and store
   // the data in the provided buffer.  Waits up to the specified timeout (in
   // milliseconds) for data to be available.
-  virtual uint16_t readPacket(uint8_t *buffer, uint16_t maxlen, int16_t timeout) = 0;
+  virtual uint16_t readPacket(uint8_t *buffer, uint16_t maxlen,
+                              int16_t timeout) = 0;
 
   // Read a full packet, keeping note of the correct length
   uint16_t readFullPacket(uint8_t *buffer, uint16_t maxsize, uint16_t timeout);
   // Properly process packets until you get to one you want
-  uint16_t processPacketsUntil(uint8_t *buffer, uint8_t waitforpackettype, uint16_t timeout);
+  uint16_t processPacketsUntil(uint8_t *buffer, uint8_t waitforpackettype,
+                               uint16_t timeout);
 
   // Shared state that subclasses can use:
   const char *servername;
@@ -233,10 +256,11 @@ class Adafruit_MQTT {
   const char *will_payload;
   uint8_t will_qos;
   uint8_t will_retain;
+  uint16_t keepAliveInterval;    // MQTT KeepAlive time interval, in seconds
   uint8_t buffer[MAXBUFFERSIZE]; // one buffer, used for all incoming/outgoing
   uint16_t packet_id_counter;
 
- private:
+private:
   Adafruit_MQTT_Subscribe *subscriptions[MAXSUBSCRIPTIONS];
 
   void flushIncoming(uint16_t timeout);
@@ -244,35 +268,40 @@ class Adafruit_MQTT {
   // Functions to generate MQTT packets.
   uint8_t connectPacket(uint8_t *packet);
   uint8_t disconnectPacket(uint8_t *packet);
-  uint16_t publishPacket(uint8_t *packet, const char *topic, uint8_t *payload, uint16_t bLen, uint8_t qos);
+  uint16_t publishPacket(uint8_t *packet, const char *topic, uint8_t *payload,
+                         uint16_t bLen, uint8_t qos, uint16_t maxPacketLen = 0, uint8_t retain = 0);
   uint8_t subscribePacket(uint8_t *packet, const char *topic, uint8_t qos);
   uint8_t unsubscribePacket(uint8_t *packet, const char *topic);
   uint8_t pingPacket(uint8_t *packet);
   uint8_t pubackPacket(uint8_t *packet, uint16_t packetid);
 };
 
-
 class Adafruit_MQTT_Publish {
- public:
-  Adafruit_MQTT_Publish(Adafruit_MQTT *mqttserver, const char *feed, uint8_t qos = 0);
+public:
+  Adafruit_MQTT_Publish(Adafruit_MQTT *mqttserver, const char *feed,
+                        uint8_t qos = 0, uint8_t retain = 0);
 
   bool publish(const char *s);
-  bool publish(double f, uint8_t precision=2);  // Precision controls the minimum number of digits after decimal.
+  bool publish(
+      double f,
+      uint8_t precision =
+          2); // Precision controls the minimum number of digits after decimal.
               // This might be ignored and a higher precision value sent.
   bool publish(int32_t i);
   bool publish(uint32_t i);
   bool publish(uint8_t *b, uint16_t bLen);
 
-
 private:
   Adafruit_MQTT *mqtt;
   const char *topic;
   uint8_t qos;
+  uint8_t retain;
 };
 
 class Adafruit_MQTT_Subscribe {
- public:
-  Adafruit_MQTT_Subscribe(Adafruit_MQTT *mqttserver, const char *feedname, uint8_t q=0);
+public:
+  Adafruit_MQTT_Subscribe(Adafruit_MQTT *mqttserver, const char *feedname,
+                          uint8_t q = 0);
 
   void setCallback(SubscribeCallbackUInt32Type callb);
   void setCallback(SubscribeCallbackDoubleType callb);
@@ -295,9 +324,10 @@ class Adafruit_MQTT_Subscribe {
 
   AdafruitIO_MQTT *io_mqtt;
 
- private:
+  bool new_message;
+
+private:
   Adafruit_MQTT *mqtt;
 };
 
-
 #endif

Adafruit_MQTT_Client.cpp

@@ -9,8 +9,8 @@
 // copies of the Software, and to permit persons to whom the Software is
 // furnished to do so, subject to the following conditions:
 //
-// The above copyright notice and this permission notice shall be included in all
-// copies or substantial portions of the Software.
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
 //
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
@@ -21,15 +21,16 @@
 // SOFTWARE.
 #include "Adafruit_MQTT_Client.h"
 
-
 bool Adafruit_MQTT_Client::connectServer() {
   // Grab server name from flash and copy to buffer for name resolution.
   memset(buffer, 0, sizeof(buffer));
   strcpy((char *)buffer, servername);
-  DEBUG_PRINT(F("Connecting to: ")); DEBUG_PRINTLN((char *)buffer);
+  DEBUG_PRINT(F("Connecting to: "));
+  DEBUG_PRINTLN((char *)buffer);
   // Connect and check for success (0 result).
   int r = client->connect((char *)buffer, portnum);
-  DEBUG_PRINT(F("Connect result: ")); DEBUG_PRINTLN(r);
+  DEBUG_PRINT(F("Connect result: "));
+  DEBUG_PRINTLN(r);
   return r != 0;
 }
 
@@ -49,19 +50,25 @@ bool Adafruit_MQTT_Client::connected() {
 
 uint16_t Adafruit_MQTT_Client::readPacket(uint8_t *buffer, uint16_t maxlen,
                                           int16_t timeout) {
-  /* Read data until either the connection is closed, or the idle timeout is reached. */
+  /* Read data until either the connection is closed, or the idle timeout is
+   * reached. */
   uint16_t len = 0;
   int16_t t = timeout;
 
+  if (maxlen == 0) { // handle zero-length packets
+    return 0;
+  }
+
   while (client->connected() && (timeout >= 0)) {
-    //DEBUG_PRINT('.');
+    // DEBUG_PRINT('.');
     while (client->available()) {
-      //DEBUG_PRINT('!');
+      // DEBUG_PRINT('!');
       char c = client->read();
       timeout = t; // reset the timeout
       buffer[len] = c;
-      //DEBUG_PRINTLN((uint8_t)c, HEX);
+      // DEBUG_PRINTLN((uint8_t)c, HEX);
       len++;
+
       if (len == maxlen) { // we read all we want, bail
         DEBUG_PRINT(F("Read data:\t"));
         DEBUG_PRINTBUFFER(buffer, len);
@@ -76,16 +83,18 @@ uint16_t Adafruit_MQTT_Client::readPacket(uint8_t *buffer, uint16_t maxlen,
 
 bool Adafruit_MQTT_Client::sendPacket(uint8_t *buffer, uint16_t len) {
   uint16_t ret = 0;
-
+  uint16_t offset = 0;
   while (len > 0) {
     if (client->connected()) {
       // send 250 bytes at most at a time, can adjust this later based on Client
 
       uint16_t sendlen = len > 250 ? 250 : len;
-      //Serial.print("Sending: "); Serial.println(sendlen);
-      ret = client->write(buffer, sendlen);
-      DEBUG_PRINT(F("Client sendPacket returned: ")); DEBUG_PRINTLN(ret);
+      // Serial.print("Sending: "); Serial.println(sendlen);
+      ret = client->write(buffer + offset, sendlen);
+      DEBUG_PRINT(F("Client sendPacket returned: "));
+      DEBUG_PRINTLN(ret);
       len -= ret;
+      offset += ret;
 
       if (ret != sendlen) {
         DEBUG_PRINTLN("Failed to send packet.");

Adafruit_MQTT_Client.h

@@ -9,8 +9,8 @@
 // copies of the Software, and to permit persons to whom the Software is
 // furnished to do so, subject to the following conditions:
 //
-// The above copyright notice and this permission notice shall be included in all
-// copies or substantial portions of the Software.
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
 //
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
@@ -22,40 +22,36 @@
 #ifndef _ADAFRUIT_MQTT_CLIENT_H_
 #define _ADAFRUIT_MQTT_CLIENT_H_
 
-#include "Client.h"
 #include "Adafruit_MQTT.h"
-
+#include "Client.h"
 
 // How long to delay waiting for new data to be available in readPacket.
 #define MQTT_CLIENT_READINTERVAL_MS 10
 
-
 // MQTT client implementation for a generic Arduino Client interface.  Can work
 // with almost all Arduino network hardware like ethernet shield, wifi shield,
 // and even other platforms like ESP8266.
 class Adafruit_MQTT_Client : public Adafruit_MQTT {
- public:
+public:
   Adafruit_MQTT_Client(Client *client, const char *server, uint16_t port,
-                       const char *cid, const char *user, const char *pass):
-    Adafruit_MQTT(server, port, cid, user, pass),
-    client(client)
-  {}
+                       const char *cid, const char *user, const char *pass)
+      : Adafruit_MQTT(server, port, cid, user, pass), client(client) {}
 
   Adafruit_MQTT_Client(Client *client, const char *server, uint16_t port,
-                       const char *user="", const char *pass=""):
-    Adafruit_MQTT(server, port, user, pass),
-    client(client)
-  {}
+                       const char *user = "", const char *pass = "")
+      : Adafruit_MQTT(server, port, user, pass), client(client) {}
 
-  bool connectServer();
-  bool disconnectServer();
-  bool connected();
-  uint16_t readPacket(uint8_t *buffer, uint16_t maxlen, int16_t timeout);
-  bool sendPacket(uint8_t *buffer, uint16_t len);
+  bool connected() override;
 
- private:
-  Client* client;
+protected:
+  bool connectServer() override;
+  bool disconnectServer() override;
+  uint16_t readPacket(uint8_t *buffer, uint16_t maxlen,
+                      int16_t timeout) override;
+  bool sendPacket(uint8_t *buffer, uint16_t len) override;
+
+private:
+  Client *client;
 };
 
-
 #endif

Adafruit_MQTT_FONA.h

@@ -9,8 +9,8 @@
 // copies of the Software, and to permit persons to whom the Software is
 // furnished to do so, subject to the following conditions:
 //
-// The above copyright notice and this permission notice shall be included in all
-// copies or substantial portions of the Software.
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
 //
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
@@ -22,32 +22,33 @@
 #ifndef _ADAFRUIT_MQTT_FONA_H_
 #define _ADAFRUIT_MQTT_FONA_H_
 
-#include <Adafruit_FONA.h>
 #include "Adafruit_MQTT.h"
+#include <Adafruit_FONA.h>
 
 #define MQTT_FONA_INTERAVAILDELAY 100
 #define MQTT_FONA_QUERYDELAY 500
 
-
 // FONA-specific version of the Adafruit_MQTT class.
 // Note that this is defined as a header-only class to prevent issues with using
 // the library on non-FONA platforms (since Arduino will include all .cpp files
 // in the compilation of the library).
 class Adafruit_MQTT_FONA : public Adafruit_MQTT {
- public:
+public:
   Adafruit_MQTT_FONA(Adafruit_FONA *f, const char *server, uint16_t port,
-                       const char *cid, const char *user, const char *pass):
-    Adafruit_MQTT(server, port, cid, user, pass),
-    fona(f)
-  {}
+                     const char *cid, const char *user, const char *pass)
+      : Adafruit_MQTT(server, port, cid, user, pass), fona(f) {}
 
   Adafruit_MQTT_FONA(Adafruit_FONA *f, const char *server, uint16_t port,
-                     const char *user="", const char *pass=""):
-    Adafruit_MQTT(server, port, user, pass),
-    fona(f)
-  {}
+                     const char *user = "", const char *pass = "")
+      : Adafruit_MQTT(server, port, user, pass), fona(f) {}
 
-  bool connectServer() {
+  bool connected() {
+    // Return true if connected, false if not connected.
+    return fona->TCPconnected();
+  }
+
+protected:
+  bool connectServer() override {
     char server[40];
     strncpy(server, servername, 40);
 #ifdef ADAFRUIT_SLEEPYDOG_H
@@ -59,46 +60,43 @@ class Adafruit_MQTT_FONA : public Adafruit_MQTT {
     return fona->TCPconnect(server, portnum);
   }
 
-  bool disconnectServer() {
-    return fona->TCPclose();
-  }
+  bool disconnectServer() override { return fona->TCPclose(); }
 
-  bool connected() {
-    // Return true if connected, false if not connected.
-    return fona->TCPconnected();
-  }
-
-  uint16_t readPacket(uint8_t *buffer, uint16_t maxlen, int16_t timeout) {
+  uint16_t readPacket(uint8_t *buffer, uint16_t maxlen,
+                      int16_t timeout) override {
     uint8_t *buffp = buffer;
     DEBUG_PRINTLN(F("Reading data.."));
 
-    if (!fona->TCPconnected()) return 0;
+    if (!fona->TCPconnected())
+      return 0;
 
-
-    /* Read data until either the connection is closed, or the idle timeout is reached. */
+    /* Read data until either the connection is closed, or the idle timeout is
+     * reached. */
     uint16_t len = 0;
     int16_t t = timeout;
     uint16_t avail;
 
     while (fona->TCPconnected() && (timeout >= 0)) {
-      //DEBUG_PRINT('.');
+      // DEBUG_PRINT('.');
       while (avail = fona->TCPavailable()) {
-        //DEBUG_PRINT('!');
+        // DEBUG_PRINT('!');
 
         if (len + avail > maxlen) {
           avail = maxlen - len;
-	  if (avail == 0) return len;
+          if (avail == 0)
+            return len;
         }
 
         // try to read the data into the end of the pointer
-        if (! fona->TCPread(buffp, avail)) return len;
+        if (!fona->TCPread(buffp, avail))
+          return len;
 
         // read it! advance pointer
         buffp += avail;
         len += avail;
         timeout = t; // reset the timeout
 
-        //DEBUG_PRINTLN((uint8_t)c, HEX);
+        // DEBUG_PRINTLN((uint8_t)c, HEX);
 
         if (len == maxlen) { // we read all we want, bail
           DEBUG_PRINT(F("Read:\t"));
@@ -110,18 +108,19 @@ class Adafruit_MQTT_FONA : public Adafruit_MQTT {
       Watchdog.reset();
 #endif
       timeout -= MQTT_FONA_INTERAVAILDELAY;
-      timeout -= MQTT_FONA_QUERYDELAY; // this is how long it takes to query the FONA for avail()
+      timeout -= MQTT_FONA_QUERYDELAY; // this is how long it takes to query the
+                                       // FONA for avail()
       delay(MQTT_FONA_INTERAVAILDELAY);
     }
 
     return len;
   }
 
-  bool sendPacket(uint8_t *buffer, uint16_t len) {
+  bool sendPacket(uint8_t *buffer, uint16_t len) override {
     DEBUG_PRINTLN(F("Writing packet"));
     if (fona->TCPconnected()) {
       boolean ret = fona->TCPsend((char *)buffer, len);
-      //DEBUG_PRINT(F("sendPacket returned: ")); DEBUG_PRINTLN(ret);
+      // DEBUG_PRINT(F("sendPacket returned: ")); DEBUG_PRINTLN(ret);
       if (!ret) {
         DEBUG_PRINTLN("Failed to send packet.");
         return false;
@@ -133,10 +132,9 @@ class Adafruit_MQTT_FONA : public Adafruit_MQTT {
     return true;
   }
 
- private:
+private:
   uint32_t serverip;
   Adafruit_FONA *fona;
 };
 
-
 #endif

README.md

@@ -1,4 +1,4 @@
-# Adafruit MQTT Library [![Build Status](https://travis-ci.org/adafruit/Adafruit_MQTT_Library.svg?branch=master)](https://travis-ci.org/adafruit/Adafruit_MQTT_Library)
+# Adafruit MQTT Library [![Build Status](https://github.com/adafruit/Adafruit_MQTT_Library/workflows/Arduino%20Library%20CI/badge.svg)](https://github.com/adafruit/Adafruit_MQTT_Library/actions)
 
 Arduino library for MQTT support, including access to Adafruit IO.  Works with
 the Adafruit FONA, Arduino Yun, ESP8266 Arduino platforms, and anything that supports
@@ -36,6 +36,7 @@ ESP8266            |             |             |     X       |
 Atmega2560 @ 16MHz |             |             |     X       | 
 ATSAM3X8E          |             |             |     X       | 
 ATSAM21D           |             |             |     X       | 
+ATSAMD51J20        |             |             |     X       |
 ATtiny85 @ 16MHz   |             |             |     X       | 
 ATtiny85 @ 8MHz    |             |             |     X       | 
 Intel Curie @ 32MHz |            |             |     X       | 
@@ -49,6 +50,7 @@ STM32F2            |             |             |     X       |
   * ATmega2560 @ 16MHz : Arduino Mega
   * ATSAM3X8E : Arduino Due
   * ATSAM21D : Arduino Zero, M0 Pro
+  * ATSAMD51J20: Adafruit PyPortal
   * ATtiny85 @ 16MHz : Adafruit Trinket 5V
   * ATtiny85 @ 8MHz : Adafruit Gemma, Arduino Gemma, Adafruit Trinket 3V
 

examples/adafruitio_anon_time_esp8266/.zero.test.skip

@@ -0,0 +1 @@
+

examples/adafruitio_errors_esp8266/.zero.test.skip

@@ -0,0 +1 @@
+

examples/adafruitio_secure_airlift/.esp8266.test.skip

@@ -0,0 +1 @@
+

examples/adafruitio_secure_airlift/.zero.test.skip

@@ -0,0 +1 @@
+

examples/adafruitio_secure_airlift/adafruitio_secure_airlift.ino

@@ -0,0 +1,183 @@
+/****************************************************************
+  Adafruit MQTT Library, Adafruit IO SSL/TLS Example for AirLift
+
+  Must use the latest version of nina-fw from:
+    https://github.com/adafruit/nina-fw
+
+  Works great with Adafruit AirLift ESP32 Co-Processors!
+    --> https://www.adafruit.com/product/4201
+    --> https://www.adafruit.com/product/4116
+
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit and open-source hardware by purchasing
+  products from Adafruit!
+
+  Written by Brent Rubell for Adafruit Industries.
+  MIT license, all text above must be included in any redistribution
+ *******************************************************************/
+
+#include <WiFiNINA.h>
+#include <SPI.h>
+
+// For AirLift Breakout/Wing/Shield: Configure the following to match the ESP32 Pins!
+#if !defined(SPIWIFI_SS)
+  // Don't change the names of these #define's! they match the variant ones
+  #define SPIWIFI SPI
+  #define SPIWIFI_SS 11  // Chip select pin
+  #define SPIWIFI_ACK 10 // a.k.a BUSY or READY pin
+  #define ESP32_RESETN 9 // Reset pin
+  #define ESP32_GPIO0 -1 // Not connected
+  #define SET_PINS 1     // Pins were set using this IFNDEF
+#endif
+
+#include "Adafruit_MQTT.h"
+#include "Adafruit_MQTT_Client.h"
+
+/************************* WiFi Access Point *********************************/
+
+#define WLAN_SSID "WLAN_SSID"
+#define WLAN_PASS "WIFI_PASSWORD"
+int keyIndex = 0; // your network key Index number (needed only for WEP)
+
+int status = WL_IDLE_STATUS;
+/************************* Adafruit.io Setup *********************************/
+
+#define AIO_SERVER "io.adafruit.com"
+// Using port 8883 for MQTTS
+#define AIO_SERVERPORT 8883
+// Adafruit IO Account Configuration
+// (to obtain these values, visit https://io.adafruit.com and click on Active Key)
+#define AIO_USERNAME "YOUR_ADAFRUIT_IO_USERNAME"
+#define AIO_KEY "YOUR_ADAFRUIT_IO_KEY"
+
+/************ Global State (you don't need to change this!) ******************/
+
+// WiFiSSLClient for SSL/TLS support
+WiFiSSLClient client;
+
+// Setup the MQTT client class by WLAN_PASSing in the WiFi client and MQTT server and login details.
+Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
+/****************************** Feeds ***************************************/
+
+// Setup a feed called 'test' for publishing.
+// Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname>
+Adafruit_MQTT_Publish test = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/test");
+
+/*************************** Sketch Code ************************************/
+
+void setup()
+{
+  //Initialize serial and wait for port to open:
+  Serial.begin(115200);
+  while (!Serial)
+  {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+
+  // if the AirLift's pins were defined above...
+  #ifdef SET_PINS
+    WiFi.setPins(SPIWIFI_SS, SPIWIFI_ACK, ESP32_RESETN, ESP32_GPIO0, &SPIWIFI);
+  #endif
+
+  // check for the wifi module
+  while (WiFi.status() == WL_NO_MODULE)
+  {
+    Serial.println("Communication with WiFi module failed!");
+    delay(1000);
+  }
+
+  String fv = WiFi.firmwareVersion();
+  if (fv < "1.0.0")
+  {
+    Serial.println("Please upgrade the firmware");
+  }
+
+  // attempt to connect to Wifi network:
+  Serial.print("Attempting to connect to SSID: ");
+  Serial.println(WLAN_SSID);
+  // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
+  do
+  {
+    status = WiFi.begin(WLAN_SSID, WLAN_PASS);
+    delay(100); // wait until connected
+  } while (status != WL_CONNECTED);
+  Serial.println("Connected to wifi");
+  printWiFiStatus();
+}
+
+uint32_t x = 0;
+
+void loop()
+{
+  // Ensure the connection to the MQTT server is alive (this will make the first
+  // connection and automatically reconnect when disconnected).  See the MQTT_connect
+  // function definition further below.
+  MQTT_connect();
+
+  // Now we can publish stuff!
+  Serial.print(F("\nSending val "));
+  Serial.print(x);
+  Serial.print(F(" to test feed..."));
+  if (!test.publish(x++))
+  {
+    Serial.println(F("Failed"));
+  }
+  else
+  {
+    Serial.println(F("OK!"));
+  }
+
+  // wait a couple seconds to avoid rate limit
+  delay(2000);
+}
+
+// Function to connect and reconnect as necessary to the MQTT server.
+// Should be called in the loop function and it will take care if connecting.
+void MQTT_connect()
+{
+  int8_t ret;
+
+  // Stop if already connected.
+  if (mqtt.connected())
+  {
+    return;
+  }
+
+  Serial.print("Connecting to MQTT... ");
+
+  uint8_t retries = 3;
+  while ((ret = mqtt.connect()) != 0)
+  { // connect will return 0 for connected
+    Serial.println(mqtt.connectErrorString(ret));
+    Serial.println("Retrying MQTT connection in 5 seconds...");
+    mqtt.disconnect();
+    delay(5000); // wait 5 seconds
+    retries--;
+    if (retries == 0)
+    {
+      // basically die and wait for WDT to reset me
+      while (1)
+        ;
+    }
+  }
+
+  Serial.println("MQTT Connected!");
+}
+
+void printWiFiStatus()
+{
+  // print the SSID of the network you're attached to:
+  Serial.print("SSID: ");
+  Serial.println(WiFi.SSID());
+
+  // print your board's IP address:
+  IPAddress ip = WiFi.localIP();
+  Serial.print("IP Address: ");
+  Serial.println(ip);
+
+  // print the received signal strength:
+  long rssi = WiFi.RSSI();
+  Serial.print("signal strength (RSSI):");
+  Serial.print(rssi);
+  Serial.println(" dBm");
+}

examples/adafruitio_secure_esp32/.esp8266.test.skip

@@ -0,0 +1 @@
+

examples/adafruitio_secure_esp32/.zero.test.skip

@@ -0,0 +1 @@
+

examples/adafruitio_secure_esp32/adafruitio_secure_esp32.ino

@@ -0,0 +1,160 @@
+/***********************************************************************
+  Adafruit MQTT Library ESP32 Adafruit IO SSL/TLS example
+
+  Use the latest version of the ESP32 Arduino Core:
+    https://github.com/espressif/arduino-esp32
+
+  Works great with Adafruit Huzzah32 Feather and Breakout Board:
+    https://www.adafruit.com/product/3405
+    https://www.adafruit.com/products/4172
+
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit and open-source hardware by purchasing
+  products from Adafruit!
+
+  Written by Tony DiCola for Adafruit Industries.
+  Modified by Brent Rubell for Adafruit Industries
+  MIT license, all text above must be included in any redistribution
+ **********************************************************************/
+#include <WiFi.h>
+#include "WiFiClientSecure.h"
+#include "Adafruit_MQTT.h"
+#include "Adafruit_MQTT_Client.h"
+
+/************************* WiFi Access Point *********************************/
+
+#define WLAN_SSID "WLAN_SSID"
+#define WLAN_PASS "WIFI_PASSWORD"
+
+/************************* Adafruit.io Setup *********************************/
+
+#define AIO_SERVER      "io.adafruit.com"
+
+// Using port 8883 for MQTTS
+#define AIO_SERVERPORT  8883
+
+// Adafruit IO Account Configuration
+// (to obtain these values, visit https://io.adafruit.com and click on Active Key)
+#define AIO_USERNAME "YOUR_ADAFRUIT_IO_USERNAME"
+#define AIO_KEY      "YOUR_ADAFRUIT_IO_KEY"
+
+/************ Global State (you don't need to change this!) ******************/
+
+// WiFiFlientSecure for SSL/TLS support
+WiFiClientSecure client;
+
+// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
+Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
+
+// io.adafruit.com root CA
+const char* adafruitio_root_ca = \
+    "-----BEGIN CERTIFICATE-----\n" \
+    "MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh\n" \
+    "MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3\n" \
+    "d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBD\n" \
+    "QTAeFw0wNjExMTAwMDAwMDBaFw0zMTExMTAwMDAwMDBaMGExCzAJBgNVBAYTAlVT\n" \
+    "MRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5j\n" \
+    "b20xIDAeBgNVBAMTF0RpZ2lDZXJ0IEdsb2JhbCBSb290IENBMIIBIjANBgkqhkiG\n" \
+    "9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4jvhEXLeqKTTo1eqUKKPC3eQyaKl7hLOllsB\n" \
+    "CSDMAZOnTjC3U/dDxGkAV53ijSLdhwZAAIEJzs4bg7/fzTtxRuLWZscFs3YnFo97\n" \
+    "nh6Vfe63SKMI2tavegw5BmV/Sl0fvBf4q77uKNd0f3p4mVmFaG5cIzJLv07A6Fpt\n" \
+    "43C/dxC//AH2hdmoRBBYMql1GNXRor5H4idq9Joz+EkIYIvUX7Q6hL+hqkpMfT7P\n" \
+    "T19sdl6gSzeRntwi5m3OFBqOasv+zbMUZBfHWymeMr/y7vrTC0LUq7dBMtoM1O/4\n" \
+    "gdW7jVg/tRvoSSiicNoxBN33shbyTApOB6jtSj1etX+jkMOvJwIDAQABo2MwYTAO\n" \
+    "BgNVHQ8BAf8EBAMCAYYwDwYDVR0TAQH/BAUwAwEB/zAdBgNVHQ4EFgQUA95QNVbR\n" \
+    "TLtm8KPiGxvDl7I90VUwHwYDVR0jBBgwFoAUA95QNVbRTLtm8KPiGxvDl7I90VUw\n" \
+    "DQYJKoZIhvcNAQEFBQADggEBAMucN6pIExIK+t1EnE9SsPTfrgT1eXkIoyQY/Esr\n" \
+    "hMAtudXH/vTBH1jLuG2cenTnmCmrEbXjcKChzUyImZOMkXDiqw8cvpOp/2PV5Adg\n" \
+    "06O/nVsJ8dWO41P0jmP6P6fbtGbfYmbW0W5BjfIttep3Sp+dWOIrWcBAI+0tKIJF\n" \
+    "PnlUkiaY4IBIqDfv8NZ5YBberOgOzW6sRBc4L0na4UU+Krk2U886UAb3LujEV0ls\n" \
+    "YSEY1QSteDwsOoBrp+uvFRTp2InBuThs4pFsiv9kuXclVzDAGySj4dzp30d8tbQk\n" \
+    "CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=\n" \
+    "-----END CERTIFICATE-----\n";
+
+/****************************** Feeds ***************************************/
+
+// Setup a feed called 'test' for publishing.
+// Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname>
+Adafruit_MQTT_Publish test = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/test");
+
+/*************************** Sketch Code ************************************/
+
+void setup() {
+  Serial.begin(115200);
+  delay(10);
+
+  Serial.println(F("Adafruit IO MQTTS (SSL/TLS) Example"));
+
+  // Connect to WiFi access point.
+  Serial.println(); Serial.println();
+  Serial.print("Connecting to ");
+  Serial.println(WLAN_SSID);
+
+  delay(1000);
+
+  WiFi.begin(WLAN_SSID, WLAN_PASS);
+  delay(2000);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println();
+
+  Serial.println("WiFi connected");
+  Serial.println("IP address: "); Serial.println(WiFi.localIP());
+
+  // Set Adafruit IO's root CA
+  client.setCACert(adafruitio_root_ca);
+}
+
+uint32_t x=0;
+
+void loop() {
+  // Ensure the connection to the MQTT server is alive (this will make the first
+  // connection and automatically reconnect when disconnected).  See the MQTT_connect
+  // function definition further below.
+  MQTT_connect();
+
+  // Now we can publish stuff!
+  Serial.print(F("\nSending val "));
+  Serial.print(x);
+  Serial.print(F(" to test feed..."));
+  if (! test.publish(x++)) {
+    Serial.println(F("Failed"));
+  } else {
+    Serial.println(F("OK!"));
+  }
+
+  // wait a couple seconds to avoid rate limit
+  delay(2000);
+
+}
+
+// Function to connect and reconnect as necessary to the MQTT server.
+// Should be called in the loop function and it will take care if connecting.
+void MQTT_connect() {
+  int8_t ret;
+
+  // Stop if already connected.
+  if (mqtt.connected()) {
+    return;
+  }
+
+  Serial.print("Connecting to MQTT... ");
+
+  uint8_t retries = 3;
+  while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
+       Serial.println(mqtt.connectErrorString(ret));
+       Serial.println("Retrying MQTT connection in 5 seconds...");
+       mqtt.disconnect();
+       delay(5000);  // wait 5 seconds
+       retries--;
+       if (retries == 0) {
+         // basically die and wait for WDT to reset me
+         while (1);
+       }
+  }
+
+  Serial.println("MQTT Connected!");
+}

examples/adafruitio_secure_esp8266/.zero.test.skip

@@ -0,0 +1 @@
+

examples/adafruitio_secure_esp8266/adafruitio_secure_esp8266.ino

@@ -22,15 +22,18 @@
 
 /************************* WiFi Access Point *********************************/
 
-#define WLAN_SSID       "...your SSID..."
-#define WLAN_PASS       "...your password..."
+#define WLAN_SSID       "WLAN_SSID"
+#define WLAN_PASS       "WIFI_PASSWORD"
 
 /************************* Adafruit.io Setup *********************************/
 
 #define AIO_SERVER      "io.adafruit.com"
-#define AIO_SERVERPORT  8883                   // 8883 for MQTTS
-#define AIO_USERNAME    "...your AIO username (see https://accounts.adafruit.com)..."
-#define AIO_KEY         "...your AIO key..."
+// Using port 8883 for MQTTS
+#define AIO_SERVERPORT  8883
+// Adafruit IO Account Configuration
+// (to obtain these values, visit https://io.adafruit.com and click on Active Key)
+#define AIO_USERNAME    "YOUR_ADAFRUIT_IO_USERNAME"
+#define AIO_KEY         "YOUR_ADAFRUIT_IO_KEY"
 
 /************ Global State (you don't need to change this!) ******************/
 
@@ -40,9 +43,13 @@ WiFiClientSecure client;
 // Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
 Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
 
-// io.adafruit.com SHA1 fingerprint. Current fingerprint can be verified via: 
-//   echo | openssl s_client -connect io.adafruit.com:443 |& openssl x509 -fingerprint -noout
-#define AIO_SSL_FINGERPRINT "77 00 54 2D DA E7 D8 03 27 31 23 99 EB 27 DB CB A5 4C 57 18"
+// io.adafruit.com SHA1 fingerprint
+/* WARNING - This value was last updated on 08/15/22 and may not be up-to-date!
+*  If security is a concern for your project, we strongly recommend users impacted by this moving
+*  to ESP32 which has certificate verification by storing root certs and having a
+*  chain-of-trust rather than doing individual certificate fingerprints.
+*/
+static const char *fingerprint PROGMEM = "18 C0 C2 3D BE DD 81 37 73 40 E7 E4 36 61 CB 0A DF 96 AD 25";
 
 /****************************** Feeds ***************************************/
 
@@ -52,11 +59,6 @@ Adafruit_MQTT_Publish test = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/t
 
 /*************************** Sketch Code ************************************/
 
-// Bug workaround for Arduino 1.6.6, it seems to need a function declaration
-// for some reason (only affects ESP8266, likely an arduino-builder bug).
-void MQTT_connect();
-void verifyFingerprint();
-
 void setup() {
   Serial.begin(115200);
   delay(10);
@@ -83,8 +85,7 @@ void setup() {
   Serial.println("IP address: "); Serial.println(WiFi.localIP());
 
   // check the fingerprint of io.adafruit.com's SSL cert
-  verifyFingerprint();
-
+  client.setFingerprint(fingerprint);
 }
 
 uint32_t x=0;
@@ -110,28 +111,6 @@ void loop() {
 
 }
 
-
-void verifyFingerprint() {
-
-  const char* host = AIO_SERVER;
-
-  Serial.print("Connecting to ");
-  Serial.println(host);
-
-  if (! client.connect(host, AIO_SERVERPORT)) {
-    Serial.println("Connection failed. Halting execution.");
-    while(1);
-  }
-
-  if (client.verify(fingerprint, host)) {
-    Serial.println("Connection secure.");
-  } else {
-    Serial.println("Connection insecure! Halting execution.");
-    while(1);
-  }
-
-}
-
 // Function to connect and reconnect as necessary to the MQTT server.
 // Should be called in the loop function and it will take care if connecting.
 void MQTT_connect() {

examples/adafruitio_time_esp8266/.zero.test.skip

@@ -0,0 +1 @@
+

examples/mqtt_2subs_esp8266/.zero.test.skip

@@ -0,0 +1 @@
+

examples/mqtt_esp8266/.zero.test.skip

@@ -0,0 +1 @@
+

examples/mqtt_esp8266/mqtt_esp8266.ino

@@ -35,7 +35,7 @@
 
 // Create an ESP8266 WiFiClient class to connect to the MQTT server.
 WiFiClient client;
-// or... use WiFiFlientSecure for SSL
+// or... use WiFiClientSecure for SSL
 //WiFiClientSecure client;
 
 // Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.

examples/mqtt_esp8266_callback/.esp8266.test.skip

@@ -0,0 +1 @@
+

examples/mqtt_esp8266_callback/.zero.test.skip

@@ -0,0 +1 @@
+

examples/mqtt_ethernet/.zero.test.skip

@@ -0,0 +1 @@
+

examples/mqtt_fona/.zero.test.skip

@@ -0,0 +1 @@
+

examples/mqtt_fona/fonahelper.cpp

@@ -1,20 +1,27 @@
+#include "Adafruit_FONA.h"
 #include <Adafruit_SleepyDog.h>
 #include <SoftwareSerial.h>
-#include "Adafruit_FONA.h"
 
-#define halt(s) { Serial.println(F( s )); while(1);  }
+#define halt(s)                                                                \
+  {                                                                            \
+    Serial.println(F(s));                                                      \
+    while (1)                                                                  \
+      ;                                                                        \
+  }
 
 extern Adafruit_FONA fona;
 extern SoftwareSerial fonaSS;
 
-boolean FONAconnect(const __FlashStringHelper *apn, const __FlashStringHelper *username, const __FlashStringHelper *password) {
+boolean FONAconnect(const __FlashStringHelper *apn,
+                    const __FlashStringHelper *username,
+                    const __FlashStringHelper *password) {
   Watchdog.reset();
 
   Serial.println(F("Initializing FONA....(May take 3 seconds)"));
 
   fonaSS.begin(4800); // if you're using software serial
 
-  if (! fona.begin(fonaSS)) {           // can also try fona.begin(Serial1) 
+  if (!fona.begin(fonaSS)) { // can also try fona.begin(Serial1)
     Serial.println(F("Couldn't find FONA"));
     return false;
   }

examples/mqtt_winc1500/.esp8266.test.skip

@@ -0,0 +1 @@
+

examples/mqtt_yun/.esp8266.test.skip

@@ -0,0 +1 @@
+

examples/mqtt_yun/.zero.test.skip

@@ -0,0 +1 @@
+

keywords.txt

@@ -1,5 +1,4 @@
 Adafruit_MQTT	KEYWORD1
-Adafruit_MQTT_CC3000	KEYWORD1
 Adafruit_MQTT_FONA	KEYWORD1
 Adafruit_MQTT_Client	KEYWORD1
 Adafruit_MQTT_Publish	KEYWORD1

library.properties

@@ -1,9 +1,10 @@
 name=Adafruit MQTT Library
-version=0.20.1
+version=2.4.3
 author=Adafruit
 maintainer=Adafruit <info@adafruit.com>
-sentence=MQTT library that supports the FONA, ESP8266, Yun, and generic Arduino Client hardware.
+sentence=MQTT library that supports the FONA, ESP8266, ESP32, Yun, and generic Arduino Client hardware.
 paragraph=Simple MQTT library that supports the bare minimum to publish and subscribe to topics.
 category=Communication
 url=https://github.com/adafruit/Adafruit_MQTT_Library
 architectures=*
+depends=Adafruit SleepyDog Library, Adafruit FONA Library, WiFi101