add iot framework

main/protocols/protocol.cc

@@ -57,3 +57,14 @@ void Protocol::SendStopListening() {
     std::string message = "{\"session_id\":\"" + session_id_ + "\",\"type\":\"listen\",\"state\":\"stop\"}";
     SendText(message);
 }
+
+void Protocol::SendIotDescriptors(const std::string& descriptors) {
+    std::string message = "{\"session_id\":\"" + session_id_ + "\",\"type\":\"iot\",\"descriptors\":" + descriptors + "}";
+    SendText(message);
+}
+
+void Protocol::SendIotStates(const std::string& states) {
+    std::string message = "{\"session_id\":\"" + session_id_ + "\",\"type\":\"iot\",\"states\":" + states + "}";
+    SendText(message);
+}
+

main/protocols/protocol.h

@@ -45,6 +45,8 @@ public:
     virtual void SendStartListening(ListeningMode mode);
     virtual void SendStopListening();
     virtual void SendAbortSpeaking(AbortReason reason);
+    virtual void SendIotDescriptors(const std::string& descriptors);
+    virtual void SendIotStates(const std::string& states);
 
 protected:
     std::function<void(const cJSON* root)> on_incoming_json_;