It might be possible with the Modular Android XMPP Service. I have never used it, so cannot help much. Nevertheless, it seems to have modules to notify of received SMS over XMPP. It may even be possible to send instructions to write a SMS.

Thanks, that ia vert encouraging! I look forward to tuwunel then 🙂

From what I read, using anything but Synapse requires to compromise on features/compatibility. I know this is not the dev’s fault, it’s from the way the Matrix spec evolve. Do you know of any resource regarding the current features/compatibility of tuwunel/conduwuit? I am particularly curious about:

• bridges
• element-call
• threads
• session verification (e.g. emoji comparison over federation)