Making MqttClient inherit from MqttClientInterface

Author: andreagilardoni

src/MqttClient.cpp

@@ -171,6 +171,98 @@ int MqttClient::messageRetain() const
   return -1;
 }
 
+void MqttClient::setClient(arduino::Client* client) {
+  if(_client != nullptr && _client->connected()) {
+    // TODO if the current client is connected we cannot perform the change, first call disconnect
+    return;
+  }
+
+  _client = client;
+}
+
+void MqttClient::setReceiveCallback(MqttReceiveCallback cbk) {
+  _cbk = cbk;
+}
+
+class MqttReadStream: public IStream {
+public:
+  MqttReadStream(MqttClient& ref, int available)
+  : ref(ref), _available(available) { }
+
+  size_t readBytes(uint8_t* buf, size_t s) override {
+    size_t to_read = s < _available ? s : _available;
+    to_read = ref.readBytes(buf, to_read);
+    _available -= to_read;
+    return to_read;
+  }
+
+  int available() override { return _available; }
+
+  int read() override {
+    if(_available > 0) {
+      _available--;
+      return ref.read();
+    } else {
+      return -1; // TODO return proper error code
+    }
+  }
+private:
+  MqttClient& ref;
+  int _available;
+};
+
+class ArduinoMqttOStream: public MqttOStream {
+public:
+  // TODO change pointer to reference, since it won't change
+	ArduinoMqttOStream(MqttClient &ref, error_t err=0)
+  : MqttOStream(err), ref(ref) { }// TODO replace err default value with success
+
+  ~ArduinoMqttOStream() {
+    ref.endMessage();
+  }
+
+  size_t write(uint8_t a) override {
+    if(rc == 1) {
+      return ref.write(a);
+    }
+    return 0;
+  }
+
+  size_t write(const uint8_t *buffer, size_t size) override {
+    if(rc == 1) {
+      return ref.write(buffer, size);
+    }
+    return 0;
+  }
+
+  int availableForWrite() override { return 0; }
+
+private:
+  MqttClient& ref;
+};
+
+
+error_t MqttClient::publish(Topic t, uint8_t payload[], size_t size, MqttQos qos, MqttPublishFlag flags) {
+  int error = this->beginMessage(t, (flags & RetainEnabled) == RetainEnabled, qos, (flags & DupEnabled) == DupEnabled);
+
+  if(error == 0) { // TODO replace this with a proper enum value
+    return error;
+  }
+
+  int res = this->write(payload, size);
+  this->endMessage();
+
+  return res;
+}
+
+MqttOStream&& MqttClient::publish(Topic t, MqttQos qos, MqttPublishFlag flags) {
+  int error = this->beginMessage(
+    t, (flags & RetainEnabled) == RetainEnabled,
+    static_cast<uint8_t>(qos), (flags & DupEnabled) == DupEnabled);
+
+  return std::move(ArduinoMqttOStream(*this, error));
+}
+
 int MqttClient::beginMessage(const char* topic, unsigned long size, bool retain, uint8_t qos, bool dup)
 {
   _txMessageTopic = topic;
@@ -259,6 +351,20 @@ int MqttClient::endMessage()
   return 1;
 }
 
+void MqttClient::setWill(
+    Topic willTopic, const uint8_t* will_message, size_t will_size, MqttQos qos, MqttPublishFlag flags) {
+  int error = this->beginWill(willTopic, (flags & RetainEnabled) == RetainEnabled, qos, (flags & DupEnabled) == DupEnabled);
+
+  if(error == 0) { // TODO replace this with a proper enum value
+    return;
+  }
+
+  int res = this->write(will_message, will_size);
+  this->endWill();
+
+  return;
+}
+
 int MqttClient::beginWill(const char* topic, unsigned short size, bool retain, uint8_t qos)
 {
   int topicLength = strlen(topic);
@@ -314,7 +420,7 @@ int MqttClient::endWill()
   return 1;
 }
 
-int MqttClient::subscribe(const char* topic, uint8_t qos)
+error_t MqttClient::subscribe(Topic topic, MqttQos qos)
 {
   int topicLength = strlen(topic);
   int remainingLength = topicLength + 5;
@@ -362,12 +468,12 @@ int MqttClient::subscribe(const char* topic, uint8_t qos)
   return 0;
 }
 
-int MqttClient::subscribe(const String& topic, uint8_t qos)
+error_t MqttClient::subscribe(const String& topic, MqttQos qos)
 {
   return subscribe(topic.c_str(), qos);
 }
 
-int MqttClient::unsubscribe(const char* topic)
+error_t MqttClient::unsubscribe(Topic topic)
 {
   int topicLength = strlen(topic);
   int remainingLength = topicLength + 4;
@@ -565,16 +671,19 @@ void MqttClient::poll()
           } else {
             _rxState = MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD;
 
-            if (_onMessage) {
+            if(_cbk) {
+              MqttReadStream stream(*this, _rxLength);
+              _cbk(_rxMessageTopic.c_str(), stream);
+            } else if (_onMessage) {
 #ifdef MQTT_CLIENT_STD_FUNCTION_CALLBACK
               _onMessage(this,_rxLength);
 #else
               _onMessage(_rxLength);
 #endif
+            }
 
-              if (_rxLength == 0) {
-                _rxState = MQTT_CLIENT_RX_STATE_READ_TYPE;
-              }
+            if ((_onMessage || _cbk) && _rxLength == 0) {
+              _rxState = MQTT_CLIENT_RX_STATE_READ_TYPE;
             }
           }
         }
@@ -592,7 +701,10 @@ void MqttClient::poll()
 
           _rxState = MQTT_CLIENT_RX_STATE_READ_PUBLISH_PAYLOAD;
 
-          if (_onMessage) {
+          if(_cbk) {
+            MqttReadStream stream(*this, _rxLength);
+            _cbk(_rxMessageTopic.c_str(), stream);
+          } else if (_onMessage) {
 #ifdef MQTT_CLIENT_STD_FUNCTION_CALLBACK
             _onMessage(this,_rxLength);
 #else
@@ -647,12 +759,12 @@ void MqttClient::poll()
   }
 }
 
-int MqttClient::connect(IPAddress ip, uint16_t port)
+error_t MqttClient::connect(IPAddress ip, uint16_t port)
 {
   return connect(ip, NULL, port);
 }
 
-int MqttClient::connect(const char *host, uint16_t port)
+error_t MqttClient::connect(const char *host, uint16_t port)
 {
   return connect((uint32_t)0, host, port);
 }
@@ -833,7 +945,7 @@ int MqttClient::subscribeQoS() const
   return _subscribeQos;
 }
 
-int MqttClient::connect(IPAddress ip, const char* host, uint16_t port)
+error_t MqttClient::connect(IPAddress ip, const char* host, uint16_t port)
 {
   if (clientConnected()) {
     _client->stop();
@@ -1041,7 +1153,7 @@ void MqttClient::pubcomp(uint16_t id)
   endPacket();
 }
 
-void MqttClient::ping()
+error_t MqttClient::ping()
 {
   uint8_t packetBuffer[2];
 

src/MqttClient.h

@@ -21,7 +21,7 @@
 #define _MQTT_CLIENT_H_
 
 #include <Arduino.h>
-#include <Client.h>
+#include "MqttInterface.h"
 
 #define MQTT_CONNECTION_REFUSED            -2
 #define MQTT_CONNECTION_TIMEOUT            -1
@@ -41,9 +41,9 @@
 
 namespace arduino {
 
-class MqttClient : public Client {
+class MqttClient : public MqttClientInterface, public Client {
 public:
-  MqttClient(Client* client);
+  MqttClient(Client* client=nullptr);
   MqttClient(Client& client);
   virtual ~MqttClient();
 
@@ -55,34 +55,54 @@ class MqttClient : public Client {
   void onMessage(void(*)(int));
 #endif
 
+  error_t publish(
+      Topic t, uint8_t payload[],
+      size_t size, MqttQos qos = QosDefault,
+      MqttPublishFlag flags = MqttPublishFlags::None);
+
+  MqttOStream&& publish(
+      Topic t, MqttQos qos = QosDefault,
+      MqttPublishFlag flags = MqttPublishFlags::None);
+
+  error_t ping() override;
+
+  void setReceiveCallback(MqttReceiveCallback cbk);
+
+  void setWill(
+      Topic willTopic, const uint8_t* will_message,
+      size_t will_size, MqttQos qos=QosDefault,
+      MqttPublishFlag flags = MqttPublishFlags::None) override;
+
+  void setClient(arduino::Client*) override;
+
   int parseMessage();
   String messageTopic() const;
   int messageDup() const;
   int messageQoS() const;
   int messageRetain() const;
 
-  int beginMessage(const char* topic, unsigned long size, bool retain = false, uint8_t qos = 0, bool dup = false);
-  int beginMessage(const String& topic, unsigned long size, bool retain = false, uint8_t qos = 0, bool dup = false);
-  int beginMessage(const char* topic, bool retain = false, uint8_t qos = 0, bool dup = false);
-  int beginMessage(const String& topic, bool retain = false, uint8_t qos = 0, bool dup = false);
+  int beginMessage(const char* topic, unsigned long size, bool retain = false, uint8_t qos = QosDefault, bool dup = false);
+  int beginMessage(const String& topic, unsigned long size, bool retain = false, uint8_t qos = QosDefault, bool dup = false);
+  int beginMessage(const char* topic, bool retain = false, uint8_t qos = QosDefault, bool dup = false);
+  int beginMessage(const String& topic, bool retain = false, uint8_t qos = QosDefault, bool dup = false);
   int endMessage();
 
-  int beginWill(const char* topic, unsigned short size, bool retain, uint8_t qos);
-  int beginWill(const String& topic, unsigned short size, bool retain, uint8_t qos);
-  int beginWill(const char* topic, bool retain, uint8_t qos);
-  int beginWill(const String& topic, bool retain, uint8_t qos);
+  int beginWill(const char* topic, unsigned short size, bool retain, uint8_t qos = QosDefault);
+  int beginWill(const String& topic, unsigned short size, bool retain, uint8_t qos = QosDefault);
+  int beginWill(const char* topic, bool retain, uint8_t qos = QosDefault);
+  int beginWill(const String& topic, bool retain, uint8_t qos = QosDefault);
   int endWill();
 
-  int subscribe(const char* topic, uint8_t qos = 0);
-  int subscribe(const String& topic, uint8_t qos = 0);
-  int unsubscribe(const char* topic);
-  int unsubscribe(const String& topic);
+  error_t subscribe(Topic topic, MqttQos qos = QosDefault) override;
+  error_t subscribe(const String& topic, MqttQos qos = QosDefault);
+  error_t unsubscribe(Topic topic) override;
+  error_t unsubscribe(const String& topic);
 
-  void poll();
+  void poll() override;
 
   // from Client
-  virtual int connect(IPAddress ip, uint16_t port = 1883);
-  virtual int connect(const char *host, uint16_t port = 1883);
+  error_t connect(IPAddress ip, uint16_t port = 1883) override;
+  error_t connect(const char *host, uint16_t port = 1883) override;
 #ifdef ESP8266
   virtual int connect(const IPAddress& ip, uint16_t port) { return 0; }; /* ESP8266 core defines this pure virtual in Client.h */
 #endif
@@ -97,10 +117,10 @@ class MqttClient : public Client {
   virtual uint8_t connected();
   virtual operator bool();
 
-  void setId(const char* id);
+  void setId(const char* id) override;
   void setId(const String& id);
 
-  void setUsernamePassword(const char* username, const char* password);
+  void setUsernamePassword(const char* username, const char* password) override;
   void setUsernamePassword(const String& username, const String& password);
 
   void setCleanSession(bool cleanSession);
@@ -123,8 +143,7 @@ class MqttClient : public Client {
   void pubrec(uint16_t id);
   void pubrel(uint16_t id);
   void pubcomp(uint16_t id);
-  void ping();
-  void disconnect();
+  void disconnect() override;
 
   int beginPacket(uint8_t type, uint8_t flags, size_t length, uint8_t* buffer);
   int writeString(const char* s, uint16_t length);
@@ -197,6 +216,8 @@ class MqttClient : public Client {
   uint16_t _willBufferIndex;
   size_t _willMessageIndex;
   uint8_t _willFlags;
+
+  MqttReceiveCallback _cbk;
 };
 }