Server-Side Framework/Language Choice

[joernneumeyer]

What programming language/framework is most suitable to handle lots of incoming messages, where possibly a lot of connections are made and terminated on the sever side?

[MirjanScholz]

MQTT

https://medium.com/@sprocompany/how-to-make-a-cool-messenger-that-works-fast-with-a-weak-internet-3f3511cf849d

https://www.hivemq.com/blog/mqtt-security-fundamentals-payload-encryption/