UE5.2 - Official MQTT Plugin

I have tried the plugin in 5.3.3, with two different brokers (Mosquitto and NanoMQ), and I can’t get it to connect. The brokers complain about parse errors, so it looks like the protocol isn’t implemented correctly?

Editor Output Log:

LogMQTTCore: Error: Error connecting socket to: 172.104.228.166:1883: SE_EISCONN, Connection state: Connected
LogMQTTCore: Verbose: Abandoning Operations
LogMQTTCore: Warning: Couldn't connect to MQTT server: There was a socket error.
LogMQTTCore: Verbose: Set State to: Connected

NanoMQ broker log:

2024-03-19 11:36:11 [35] WARN  /nanomq/nng/src/sp/transport/mqtt/broker_tcp.c:909 tcptran_pipe_recv_cb: tcptran_pipe_recv_cb: parse error rv: 139

Mosquitto broker log:

1711034343: New connection from 87.236.176.51:57167 on port 1883.
1711034346: Client <unknown> disconnected due to protocol error.
1 Like