What is the proper way to wait for a message to be sent?

[sgorblex]

I'm trying to write a simple script which just sends a message to an hardcoded chatID and exits. However, if I just exit after the sendMessage() call the message won't be sent in time; instead, if i time.Sleep a little the message is sent. Of course, this is a really bad solution, so i was wondering what is the proper way to wait for the message to be sent. I noticed a SendingState field for the type Message, although it just stays as messageSendingStatePending forever and is not really helpful.

Also, this is probably unrelated but if i call DestroyInstance() (e.g. as done in the SIGTERM handler in the sendText example) it doesn't seem to work and exists with error code 2 and a goroutine dump. I'm not really good with goroutines so you tell me.