I am looking options for communicating securely between two instances of node red across the internet.
Open one of the NRs to the internet. I don't want to do this if at all possible. I am not happy that the s/w is mature enough yet to be confident that this is secure.
Use Telegram. I was hoping to do this but have failed to get it to work [a].
Use a mosquitto MQTT server on a publicly accessible server, with tls and user/pwd. I can see that this should work ok. I also want to use Tasker on Android to send messages and I am not sure there is a stable MQTT plugin for Tasker yet, so this might not be ideal for me.
Any other suggestions?