allow unauthenticated connections to mqtt brokers

Adafruit_MQTT.cpp

@@ -232,6 +232,20 @@ int8_t Adafruit_MQTT::connect() {
   return 0;
 }
 
+int8_t Adafruit_MQTT::connect(const char *user, const char *pass)
+{
+  username = user;
+  password = pass;
+  return connect();
+}
+
+int8_t Adafruit_MQTT::connect(const __FlashStringHelper *user, const __FlashStringHelper *pass)
+{
+  username = (const char*)user;
+  password = (const char*)pass;
+  return connect();
+}
+
 uint16_t Adafruit_MQTT::processPacketsUntil(uint8_t *buffer, uint8_t waitforpackettype, uint16_t timeout) {
   uint16_t len;
   while (len = readFullPacket(buffer, MAXBUFFERSIZE, timeout)) {

Adafruit_MQTT.h

@@ -133,8 +133,8 @@ class Adafruit_MQTT {
                 const __FlashStringHelper *pass);
   Adafruit_MQTT(const char *server,
                 uint16_t port,
-                const char *user,
-                const char *pass);
+                const char *user = "",
+                const char *pass = "");
   Adafruit_MQTT(const __FlashStringHelper *server,
                 uint16_t port,
                 const __FlashStringHelper *user,
@@ -153,6 +153,8 @@ class Adafruit_MQTT {
   // Use connectErrorString() to get a printable string version of the
   // error.
   int8_t connect();
+  int8_t connect(const char *user, const char *pass);
+  int8_t connect(const __FlashStringHelper *user, const __FlashStringHelper *pass);
 
   // Return a printable string version of the error code returned by
   // connect(). This returns a __FlashStringHelper*, which points to a

Adafruit_MQTT_CC3000.h

@@ -44,7 +44,7 @@ class Adafruit_MQTT_CC3000 : public Adafruit_MQTT {
   {}
 
   Adafruit_MQTT_CC3000(Adafruit_CC3000 *cc3k, const char *server, uint16_t port,
-                       const char *user, const char *pass):
+                       const char *user = "", const char *pass = ""):
     Adafruit_MQTT(server, port, user, pass),
     cc3000(cc3k)
   {}

Adafruit_MQTT_Client.h

@@ -42,7 +42,7 @@ class Adafruit_MQTT_Client : public Adafruit_MQTT {
   {}
 
   Adafruit_MQTT_Client(Client *client, const char *server, uint16_t port,
-                       const char *user, const char *pass):
+                       const char *user="", const char *pass=""):
     Adafruit_MQTT(server, port, user, pass),
     client(client)
   {}

Adafruit_MQTT_FONA.h

@@ -42,7 +42,7 @@ class Adafruit_MQTT_FONA : public Adafruit_MQTT {
   {}
 
   Adafruit_MQTT_FONA(Adafruit_FONA *f, const char *server, uint16_t port,
-                     const char *user, const char *pass):
+                     const char *user="", const char *pass=""):
     Adafruit_MQTT(server, port, user, pass),
     fona(f)
   {}