ESP MQTT quasi-broker library ?

[rin67630]

Hi does someone know a MQTT receiver (consumer of publish messages) library i.e behaving like a broker, not a subscriber?.

The purpose is to receive MQTT messages from devices that can only send unencrypted MQTT messages in a LAN where they are relatively safe, eventually to forward them encrypted to the Internet or to process them internally.

Thank you for any advice.

Regards
Laszlo