How to subscribe to multiple topic using paho MQTT in arduino

[sunilsud]

i am able to publish to multiple topic how do i subscribe to multiple topic1 and topic 2 right now only topic1 i can subscribe

void subscribe(){

//subscript to a topic

client->subscribe(topic1,MQTT::QOS0,messageArrived1);

client->subscribe(topic2,MQTT::QOS0,messageArrived2);

}

void messageArrived1(MQTT::MessageData& md) { MQTT::Message &message = md.message;

char* msg = new char[message.payloadlen+1](); memcpy (msg,message.payload,message.payloadlen); json_msg = msg; Serial.print(json_msg); parse_json(); delete msg;

} void messageArrived2(MQTT::MessageData& Md) { MQTT::Message &message = Md.message;

char* msg = new char[message.payloadlen+1](); memcpy (msg,message.payload,message.payloadlen); json_msg = msg; Serial.print(json_msg); parse_json(); delete msg;

}

[odelot]

When you create the client, you need to inform the max number os message handlers.

In the example, it is set to 1. Use 2.

const int maxMQTTMessageHandlers = 1;
MQTT::Client<IPStack, Countdown, maxMQTTpackageSize, maxMQTTMessageHandlers> *client = NULL;

[sunilsud]

its working

[sunilsud]

thanks

[rakeshcomavia]

thank you for help, its working