MQTT retained messages and new topic 'status' #52
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MQTT messages will be send as retained, so new connected subscribers will recive last valid data and don't have to wait for new data. New topic _status_ which will let the subscribers know if the radio is online/connected to mqtt broker. On initial connection to mqtt broker a last will is defined. This last will will be published to the topic _status_ if the connection to the mqtt broker is lost (power down, connection issues,...). The last will publishes the message "offline".
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MQTT messages will be send as retained, so new connected subscribers
will receive last valid data and don't have to wait for new data.
New topic status which will let the subscribers know if the radio is
online/connected to mqtt broker.
On initial connection to mqtt broker a last will is defined. This last
will will be published to the topic status if the connection to the
mqtt broker is lost (power down, connection issues,...). The last will
publishes the message "offline".