Not processing the received non-interactive auth and dake dake message about pidgin-otrng

[olabini]

This is not really a bug in our code - it's a bug in the docker-compose, where it doesn't have write permissions to the mapped volume, thus can't store offline messages.
The way to fix it is to figure out the uid/gid of the inside-docker prosody user, and then chmod the docker-compose prosody/data directory.

This does have another implication - we should check if the server has msgoffline among the features in disco#info - as described in https://xmpp.org/extensions/xep-0160.html - we should also notice when an offline message delivery fails, and handle properly.

[claucece]

Thanks! @olabini

This does have another implication - we should check if the server has msgoffline among the features in disco#info - as described in https://xmpp.org/extensions/xep-0160.html - we should also notice when an offline message delivery fails, and handle properly.

I'll put this on the appropriate issue.