Add LWT and modbus status publishing. #63
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Modbus status is published under `<prefix>/madbus4mqtt/modbus_status` in JSON format. JSON content: - `status`: any of `online`, `offline` or `reconnecting`, describing current modbus state - `timestamp`: contains a timestamp in ISO 8601 format (e.g. 2024-09-24T01:23:45+0000)
Current MQTT connection status of modbus4mqtt is published under `<prefix>/modbus4mqtt`. JSON content: - `status`: either `online` or `offline` - `version`: `modbus4mqtt version` - `timestamp`: time of last status update, in ISO8601 format.
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Closes #61 .
Implemented changes
<prefix>/modbus4mqtt/modbus_statusin JSON format.status: any ofonline,offlineorreconnecting, describing current modbus statetimestamp: contains a timestamp in ISO 8601 format (e.g.2024-09-24T01:23:45+0000) of the latest published status change.<prefix>/modbus4mqttis now updated to a more complete Last Will Topic in JSON format.status: any ofonline,offline, describing current connection state.version: contains the modbus4mqtt versiontimestamp: contains a timestamp in ISO 8601 format (e.g.2024-09-24T01:23:45+0000) of the latest published status change.To implement (requiring feedback):
connect_modbus()afterconnect_mqtt()on startup (see comment)OR