mqtt client usable to connect to 2 mqtt brokers?

[pottendo]

hi,

thanks for this nice lib. I use it on an esp32/arduino. I experience some issues to connect to two mqtt brokers from one application:

• one for 'application vital' exchange with a small esp8266 broker (uMQTTBroker)
• one to spill out some logging once in a while to a public mqtt service - called from a separate FreeRTOS task, independently from the reset with low frequency (every few minutes, delay of 250ms between subsequent publish() calls).

the first connection is stable, however the second seems to be unstable. Only a fraction of the expected messages are being received on the broker side.

Can anyone here confirm that 2 client instances can be used from one application? Or the other way round, by confirming that the lib is not thread-safe enough or not supporting 2 or more client connections.

thanks, pottendo

PS: my code instantiates 2 MQTTBroker clients and configures 2 brokers respectively. I've put a mutex to protect against concurrent calls to the publish() method. the second client doen't subscribe to any subjects - it's just supposed to publish.

[pottendo]

hi, it seems that I've stumbled over the message size limit - having added a time-stamp, I've create messages longer than the default of 128bytes. I've increased the message size, and now it seems to work as expected. Sorry for the noise, pottendo