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Adafruit_MQTT_Library/Adafruit_MQTT.cpp

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// The MIT License (MIT)
//
// Copyright (c) 2015 Adafruit Industries
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// 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 SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include "Adafruit_MQTT.h"
void printBuffer(uint8_t *buffer, uint8_t len) {
for (uint8_t i=0; i<len; i++) {
if (isprint(buffer[i]))
DEBUG_PRINTER.write(buffer[i]);
else
DEBUG_PRINTER.print(" ");
DEBUG_PRINTER.print(F(" [0x"));
if (buffer[i] < 0x10)
DEBUG_PRINTER.print("0");
DEBUG_PRINTER.print(buffer[i],HEX);
DEBUG_PRINTER.print("], ");
if (i % 8 == 7) DEBUG_PRINTER.println();
}
DEBUG_PRINTER.println();
}
static uint8_t *stringprint(uint8_t *p, char *s) {
uint16_t len = strlen(s);
p[0] = len >> 8; p++;
p[0] = len & 0xFF; p++;
memcpy(p, s, len);
return p+len;
}
static uint8_t *stringprint_P(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.
uint16_t len = strlen_P(s);
if (maxlen > 0 && len > maxlen) {
len = maxlen;
}
/*
for (uint8_t i=0; i<len; i++) {
Serial.write(pgm_read_byte(s+i));
}
*/
p[0] = len >> 8; p++;
p[0] = len & 0xFF; p++;
strncpy_P((char *)p, s, len);
return p+len;
}
// Adafruit_MQTT Definition ////////////////////////////////////////////////////
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;
username = user;
password = pass;
for (uint8_t i=0; i<MAXSUBSCRIPTIONS; i++) {
subscriptions[i] = 0;
}
}
/*
Adafruit_MQTT::Adafruit_MQTT(char *server, uint16_t port, char *cid, char *user, char *pass) {
strncpy(servername, server, SERVERNAME_SIZE);
servername[SERVERNAME_SIZE-1] = 0;
portnum = port;
serverip = 0;
strncpy(clientid, cid, CLIENTID_SIZE);
clientid[CLIENTID_SIZE-1] = 0;
strncpy(username, user, USERNAME_SIZE);
username[USERNAME_SIZE-1] = 0;
strncpy(password, pass, PASSWORD_SIZE);
password[PASSWORD_SIZE-1] = 0;
}
*/
int8_t Adafruit_MQTT::connect() {
// Connect to the server.
if (!connectServer())
return -1;
// Construct and send connect packet.
uint8_t len = connectPacket(buffer);
if (!sendPacket(buffer, len))
return -1;
// Read connect response packet and verify it
len = readPacket(buffer, 4, CONNECT_TIMEOUT_MS);
if (len != 4)
return -1;
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++) {
// Ignore subscriptions that aren't defined.
if (subscriptions[i] == 0) continue;
// Construct and send subscription packet.
uint8_t len = subscribePacket(buffer, subscriptions[i]->topic, subscriptions[i]->qos);
if (!sendPacket(buffer, len))
return -1;
// Get SUBACK
len = readPacket(buffer, 5, CONNECT_TIMEOUT_MS);
DEBUG_PRINT(F("SUBACK:\t"));
DEBUG_PRINTBUFFER(buffer, len);
if ((len != 5) || (buffer[0] != (MQTT_CTRL_SUBACK << 4))) {
return 6; // failure to subscribe
}
}
return 0;
}
bool Adafruit_MQTT::publish(const char *topic, char *data, uint8_t qos) {
// Construct and send publish packet.
uint8_t len = publishPacket(buffer, topic, data, qos);
if (!sendPacket(buffer, len))
return false;
// If QOS level is high enough verify the response packet.
if (qos > 0) {
len = readPacket(buffer, 4, PUBLISH_TIMEOUT_MS);
DEBUG_PRINT(F("Publish QOS1+ reply:\t"));
DEBUG_PRINTBUFFER(buffer, len);
//TODO: Verify response packet?
}
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++) {
if (subscriptions[i] == sub) {
DEBUG_PRINTLN(F("Already subscribed"));
break;
}
}
if (i==MAXSUBSCRIPTIONS) { // add to subscriptionlist
for (i=0; i<MAXSUBSCRIPTIONS; i++) {
if (subscriptions[i] == 0) {
DEBUG_PRINT(F("Added sub ")); DEBUG_PRINTLN(i);
subscriptions[i] = sub;
break;
}
}
}
if (i==MAXSUBSCRIPTIONS) {
DEBUG_PRINTLN(F("no more subscription space :("));
return false;
}
}
Adafruit_MQTT_Subscribe *Adafruit_MQTT::readSubscription(int16_t timeout) {
uint8_t i, topiclen, datalen;
// Check if data is available to read.
uint16_t len = readPacket(buffer, MAXBUFFERSIZE, timeout, true); // return one full packet
if (!len)
return NULL; // No data available, just quit.
DEBUG_PRINTBUFFER(buffer, len);
// Parse out length of packet.
topiclen = buffer[3];
DEBUG_PRINT(F("Looking for subscription len ")); DEBUG_PRINTLN(topiclen);
// Find subscription associated with this packet.
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.
if (strlen_P(subscriptions[i]->topic) != topiclen)
continue;
// Stop if the subscription topic matches the received topic. Be careful
// to make comparison case insensitive.
if (strncasecmp_P((char*)buffer+4, subscriptions[i]->topic, topiclen) == 0) {
DEBUG_PRINT(F("Found sub #")); DEBUG_PRINTLN(i);
break;
}
}
}
if (i==MAXSUBSCRIPTIONS) return NULL; // matching sub not found ???
// zero out the old data
memset(subscriptions[i]->lastread, 0, SUBSCRIPTIONDATALEN);
datalen = len - topiclen - 4;
if (datalen > SUBSCRIPTIONDATALEN) {
datalen = SUBSCRIPTIONDATALEN-1; // cut it off
}
// extract out just the data, into the subscription object itself
memcpy(subscriptions[i]->lastread, buffer+4+topiclen, datalen);
DEBUG_PRINT(F("Data len: ")); DEBUG_PRINTLN(datalen);
DEBUG_PRINT(F("Data: ")); DEBUG_PRINTLN((char *)subscriptions[i]->lastread);
// return the valid matching subscription
return subscriptions[i];
}
bool Adafruit_MQTT::ping(uint8_t times) {
while (times) {
// Construct and send ping packet.
uint8_t len = pingPacket(buffer);
if (!sendPacket(buffer, len))
return false;
// Process ping reply.
len = readPacket(buffer, 2, PING_TIMEOUT_MS);
if (buffer[0] == (MQTT_CTRL_PINGRESP << 4))
return true;
}
return false;
}
// Packet Generation Functions /////////////////////////////////////////////////
// The current MQTT spec is 3.1.1 and available here:
// http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718028
// However this connect packet and code follows the MQTT 3.1 spec here (some
// small differences in the protocol):
// http://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#connect
uint8_t Adafruit_MQTT::connectPacket(uint8_t *packet) {
uint8_t *p = packet;
uint16_t len;
// fixed header, connection messsage no flags
p[0] = (MQTT_CTRL_CONNECT << 4) | 0x0;
p+=2;
// fill in packet[1] last
p = stringprint_P(p, PSTR("MQIsdp"));
p[0] = MQTT_PROTOCOL_LEVEL;
p++;
p[0] = MQTT_CONN_CLEANSESSION;
if (pgm_read_byte(username) != 0)
p[0] |= MQTT_CONN_USERNAMEFLAG;
if (pgm_read_byte(password) != 0)
p[0] |= MQTT_CONN_PASSWORDFLAG;
p++;
// TODO: add WILL support?
p[0] = MQTT_CONN_KEEPALIVE >> 8;
p++;
p[0] = MQTT_CONN_KEEPALIVE & 0xFF;
p++;
p = stringprint_P(p, clientid, 23); // Limit client ID to first 23 characters.
if (pgm_read_byte(username) != 0) {
p = stringprint_P(p, username);
}
if (pgm_read_byte(password) != 0) {
p = stringprint_P(p, password);
}
len = p - packet;
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;
}
uint8_t Adafruit_MQTT::publishPacket(uint8_t *packet, const char *topic,
char *data, uint8_t qos) {
uint8_t *p = packet;
uint16_t len;
p[0] = MQTT_CTRL_PUBLISH << 4 | qos << 1;
// fill in packet[1] last
p+=2;
p = stringprint_P(p, topic);
memcpy(p, data, strlen(data));
p+=strlen(data);
len = p - packet;
packet[1] = len-2; // don't include the 2 bytes of fixed header data
DEBUG_PRINTLN(F("MQTT publish packet:"));
DEBUG_PRINTBUFFER(buffer, len);
return len;
}
uint8_t Adafruit_MQTT::subscribePacket(uint8_t *packet, const char *topic,
uint8_t qos) {
uint8_t *p = packet;
uint16_t len;
p[0] = MQTT_CTRL_SUBSCRIBE << 4 | MQTT_QOS_1 << 1;
// fill in packet[1] last
p+=2;
// put in a message id,
p[0] = 0xAD;
p[1] = 0xAF;
p+=2;
p = stringprint_P(p, topic);
p[0] = qos;
p++;
len = p - packet;
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::pingPacket(uint8_t *packet) {
packet[0] = MQTT_CTRL_PINGREQ << 4;
packet[1] = 0;
DEBUG_PRINTLN(F("MQTT ping packet:"));
DEBUG_PRINTBUFFER(buffer, 2);
return 2;
}
// Adafruit_MQTT_Publish Definition ////////////////////////////////////////////
Adafruit_MQTT_Publish::Adafruit_MQTT_Publish(Adafruit_MQTT *mqttserver,
const char *feed, uint8_t q) {
mqtt = mqttserver;
topic = feed;
qos = q;
}
bool Adafruit_MQTT_Publish::publish(int32_t i) {
char payload[18];
itoa(i, payload, 10);
return mqtt->publish(topic, payload, qos);
}
bool Adafruit_MQTT_Publish::publish(double f, uint8_t precision) {
char payload[40]; // Need to technically hold float max, 39 digits and minus sign.
#if defined(ARDUINO_ARCH_AVR)
// Use avrlibc dtostre function on AVR platforms.
dtostrf(f, 0, precision, payload);
#else
// Otherwise fall back to snprintf on other platforms.
snprintf(payload, sizeof(payload)-1, "%f", f);
#endif
return mqtt->publish(topic, payload, qos);
}
bool Adafruit_MQTT_Publish::publish(uint32_t i) {
char payload[18];
itoa(i, payload, 10);
return mqtt->publish(topic, payload, qos);
}
bool Adafruit_MQTT_Publish::publish(char *payload) {
return mqtt->publish(topic, payload, qos);
}
// Adafruit_MQTT_Subscribe Definition //////////////////////////////////////////
Adafruit_MQTT_Subscribe::Adafruit_MQTT_Subscribe(Adafruit_MQTT *mqttserver,
const char *feed, uint8_t q) {
mqtt = mqttserver;
topic = feed;
qos = q;
}
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