examples: Add ability for mqtt_relay to use a config file #3013
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examples: Add ability for mqtt_relay to use a config file
This commit adds the ability to read config values from
rtl_433_mqtt_relay.yaml (overriding defaults). This read is skipped
if the yaml module can't be loaded or the config file can't be read,
so those without PyYAML or a config file see no change.
Those with a config file can set parameters for address/port to listen
for json-in-sylog, MQTT credentials, whether to post individual
values, a json dictionary, or both.
While rudimentary, this is a huge functional improvement, allowing
those using TLS and broker passwords (as arguably all should be) to
use the script without modifying it.