Most of the time this works great, but once and and a while I do not recieve a response from the http Post. This is more than likley due to a weak cellular connection. When this happens, I redo the http Post and usually get a server response the second time. The problem is, the talkback was already executed on the first try that was not recieved. That means the second try does not contain the Talkback. Any ideas on how to overcome this issue?
One possible solution, though possibly expensive in terms of bytes would be to read the command - instead of executing. Then when once you get the command, send the execute command to remove the old from the list but ignore the response.
The get command requires the talkback ID, but you could get all commands and read the last one.
Out of curiosity, are you using talkbacks as a mechanism for 2 devices to synchronize values/state? If so, rather than a polling model, perhaps you can consider using MQTT publish and subscribe to a topic that is one of the fields on your channel?