How can i get publish message failed info or a failed callBack？

[GMCoder]

No description provided.

[GMCoder]

When i publish a message，i want get a failed call back.Just have success call back now.

[dbburgess]

I don't think this library supports that. You could set the QoS to something higher to confirm the message was received, but that wouldn't help too much with catching errors sending, unfortunately.

[GMCoder]

Thank you，I think solve this problem should be change other library.Can you give me some advice？

[dbburgess]

You're welcome. I'm not sure I understand. Do you want to try to modify this library to support it?

[GMCoder]

Yes,how can i modify this library to support it?

[dbburgess]

This project is no longer maintained, but you are free to fork it and modify it to suit your needs.

The relevant section is here, where the publishData method is. It's just a wrapper around mosquitto, so you can look there for more details. The publish method being used does actually return values that could be used for at least some error handling.

Those links should help you get started. Beyond that, I probably can't be of much help. Good luck!

[GMCoder]

Thank you!I am so grateful to you.