I’m using a RUT955 with firmware 7.04.5 as MQTT broker. I’ve installed a RUT956 with firmware 7.5 as additional MQTT broker using the same MQTT configuration.
The network access is from mob1s1a1 (private APN), and I can publish items from MQTT explorer using an USB+SIM network card, but I can’t connect from a RUT955 to publish items (this router is currently publishing items on the RUT955 with firmware 7.04.5).
This problem is very particular: I cant run from RUT955 subscriber “telnet IP_broker_956 22” and it works, “telnet IP_broker_956 80” also works, but “telnet IP_broker_956 1883” doesn’t work just from the RUT955 subscriber, but I can connect from my laptop using an USB+SIM network card.
I suspect that firmware 7.5 is plenty of bugs: MQTT, serial over IP, … something has had to be changed to obtain this storm of errors.
By the way, all the MQTT broker routers were reset and configured from zero.
Thanks in advance.