The class declaration for the Listener class looks like this:
class Listener : public mosqpp::mosquittopp { // public: Listener(string clientId, string host, int port, string user, string pass); ~Listener(); void on_connect(int rc); void on_message(const struct mosquitto_message* message); void on_subscribe(int mid, int qos_count, const int* granted_qos); void sendMessage(string topic, string& message); void sendMessage(string& topic, char* message, int msgLength); };
This class provides a simple API to connect to an MQTT broker and send messages to said broker. We inherit from the mosquittopp class, re-implementing a number of callback methods to handle the events of connecting newly received messages and completed subscriptions ...
