Adding an additional ArduinoMqttClient constructor as well as a method setClient to allow late initialisation. (#37)

This allows for the ArduinoIoTCloud firmware to intantiate ArduinoMqttClient on the stack instead of the heap.

Author: aentinger

Diff for: src/MqttClient.cpp

@@ -61,8 +61,8 @@ enum {
   MQTT_CLIENT_RX_STATE_DISCARD_PUBLISH_PAYLOAD
 };
 
-MqttClient::MqttClient(Client& client) :
-  _client(&client),
+MqttClient::MqttClient(Client* client) :
+  _client(client),
   _onMessage(NULL),
   _cleanSession(true),
   _keepAliveInterval(60 * 1000L),
@@ -82,6 +82,11 @@ MqttClient::MqttClient(Client& client) :
   setTimeout(0);
 }
 
+MqttClient::MqttClient(Client& client) : MqttClient(&client)
+{
+
+}
+
 MqttClient::~MqttClient()
 {
   if (_willBuffer) {

Diff for: src/MqttClient.h

@@ -34,9 +34,14 @@
 
 class MqttClient : public Client {
 public:
+  MqttClient(Client* client);
   MqttClient(Client& client);
   virtual ~MqttClient();
 
+
+  inline void setClient(Client& client) { _client = &client; }
+
+
   void onMessage(void(*)(int));
 
   int parseMessage();