Gateway id override #62
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…mqtt loop before polling backend
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Actually, mqtt-forwarder fetches the gateway_id from the backend (either concentratord or semtech_udp). In cases where either concentratord / semtech packet forwarder cannot start for various reasons (i.e: hardware problem with the LoRa card), mqtt-forwarder stalls there and no MQTT connection to the remote broker is made (which is fair enough). This means remote commands cannot be executed anymore because it requires an MQTT connection for that.
The proposed feature is to allow the possibility to override the gateway_id in the configuration file. If set by the user, the mqtt client will use the overriden gateway_id in the configuration file rather than waiting for the backend to respond. This allows for remote command execution (which is a nice feature of mqtt-forwarder), even though no concentrator / packet forwarder backend is started.
If gateway_id is not overriden, mqtt-forwarder operates as usual.
Tested successfully on MultiTech MTCAP / MTCDT gateways.