Hello. I'm using your library inside my class and when I try to pass a method of my class (not a global function) to your onMessage() function to set it as a callback, the compiler fails. I think this is because the the callback format you propose is:
256dpi
commented
3 years ago
Hello. I'm using your library inside my class and when I try to pass a method of my class (not a global function) to your onMessage() function to set it as a callback, the compiler fails. I think this is because the the callback format you propose is:
typedef void (*MQTTClientCallbackSimple)(String &topic, String &payload);And this does not allow to bind the this pointer to the callback.
In this case, the callback setting should look like this:
mqttObject.onMessage(std::bind(&_DataSender::messageReceivedCallback, this, std::placeholders::_1, std::placeholders::_2));Where mqttObject is an object inside the _DataSender class and messageReceivedCallback is a method inside _DataSender class.
I'm not really sure but I think this could be fixed if the prototype of the callback function gets changed to this:
typedef std::function<void(String &topic, String &payload)> MQTTClientCallbackSimple;And include this in the MQTTClient.h :
#include <functional>Thanks!! Gonzalo