How to know publish is successful or failed when qos is 1 or 2 and how to retry it manually? about gmqtt

[Mixser]

Hi @VinceWg

Currently gmqtt doesn't have an easy way to do it. But it's not imposible.

If you just want to know when your qos1-2 message has not been delivered (we didn't receive PUBACK) you may implement this by inheriting from gmqtt.storage.BasePersistentStorage. Then you must pass the instance of you storage to Client __init__ method by kwargs persistent_storage=you_storage_impl_instance.

About manualy retry. This more complicated because this logic has been implemented in Client at _resend_qos_messages and there is no other way to configure this (only inherite and overwrite this method). Also you can implement logic about which messsage you need to resend in your storage implementation, but messages in storage will be in raw view (bytes).

[WingRF]

@Mixser
Thx much for your explain, it gives me a clear solution.