C++ (Cpp) MqttSubscribe示例

示例#1

文件： ATT_IOT.cpp 项目： allthingstalk/arduino-client

//tries to create a connection with the mqtt broker. also used to try and reconnect.
bool ATTDevice::MqttConnect()
{
	char mqttId[23]; // Or something long enough to hold the longest file name you will ever use.
	int length = _deviceId.length();
	length = length > 22 ? 22 : length;
    _deviceId.toCharArray(mqttId, length);
	mqttId[length] = 0;
	if(_mqttUserName && _mqttpwd){
		if (!_mqttclient->connect(mqttId, (char*)_mqttUserName, (char*)_mqttpwd)) 
		{
			#ifdef DEBUG
			Serial.print(MQTTSERVTEXT);
			Serial.println(FAILED_RETRY);
			#endif
			return false;
		}
		#ifdef DEBUG
		Serial.print(MQTTSERVTEXT);
		Serial.println(SUCCESTXT);
		#endif
		MqttSubscribe();
		return true;
	}
	else{
		#ifdef DEBUG
		Serial.print(MQTTSERVTEXT);
		Serial.println("failed: invalid credentials");
		#endif
		return false;
	}
}

示例#2

文件： ATT_IOT.cpp 项目： amlo13/arduino-client

//tries to create a connection with the mqtt broker. also used to try and reconnect.
void ATTDevice::MqttConnect()
{
	char mqttId[23]; // Or something long enough to hold the longest file name you will ever use.
	int length = _deviceId.length();
	length = length > 22 ? 22 : length;
    _deviceId.toCharArray(mqttId, length);
	mqttId[length] = 0;
	String brokerId = _clientId + ":" + _clientId;
	while (!_mqttclient->connect(mqttId, (char*)brokerId.c_str(), (char*)_clientKey.c_str())) 
	{
		#ifdef DEBUG
		Serial.print(MQTTSERVTEXT);
		Serial.println(FAILED_RETRY);
		#endif
		delay(RETRYDELAY);
	}
	#ifdef DEBUG
	Serial.print(MQTTSERVTEXT);
	Serial.println(SUCCESTXT);
	#endif
	MqttSubscribe();
}