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Sniffing RS485 MODBUS data

jacikaas last edited by

Hello,

I have installed ventilation system in my apartment with this LCD acting like separate device:

It have 4 wires connected. After researching I found main board uses RS485 MODBUS:

I know there is Arduino RS485 modules, which probably could simulate signals to main board. But main problem is I don't know what messages there are. I tried to look for some suggestions on internet, but had no luck. Could some point me how to read this LCD messages to main board so I could simulate same messages over Arduino?

Thanks!
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@eiten said in Saving last known good state, but not in EEPROM: utility meter in home assistant This is exactly what I am seeking! Thank you! PS I truly enjoy reverse translating! It teaches me how to better understand my first language and it gives me alternate words to use in searches. So a second thank you! "Regelmässiges Zurücksetzen" would be best translated to English in this context as "Periodic Reset". In the English version of Home Assistant it is called "Meter reset cycle" (I remember seeing "keep dry" translated as "do not take in shower with you"
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Thanks, I'll keep this in mind if I decide to debug it. I realized that I am also tired of patching the gateway through to the doctor container inside an LXC so now I am looking at creating an esp gateway. Just need to check if I can find a pcb on here. Thanks again!
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@bgunnarb I like @eiten 's solution for you. Personally, I am not a fan of using cloud/public brokers. Thus I am curious about your system and there is something about it from which I can learn. I would like to understand why you cannot deploy your own mosquitto broker. I see your set up as 3 sensor groups defined by the channel used #define MY_RF24_CHANNEL ChannelOfSensorGroup Each sensor group has some number of sensors and one MQTT GW on ESP8266. On the MQTT side, do you distinguish between gateways by using a different host name? Something like: #define MY_MQTT_PUBLISH_TOPIC_PREFIX "mygateway-nOf3-out" #define MY_MQTT_SUBSCRIBE_TOPIC_PREFIX "mygateway-nOf3-in" #define MY_MQTT_CLIENT_ID "mysensors-nOf3" #define MY_HOSTNAME "ESP8266_MQTT_GW_nOf3" //#define MY_CONTROLLER_IP_ADDRESS 192, 168, 178, 68 #define MY_CONTROLLER_URL_ADDRESS "test.mosquitto.org" #define MY_PORT 1883 I must assume your controller (aka Home Assistant) discriminates between through which gateway the data is to flow by way of the different topic names. If my "something like" is correct, then changing brokers is changing the IPaddress/URL in your gateways and in your controller (though if the controller is Home Assistant, it may be a bother because the device-id's may change which will make a mess of all the work you've done in HA. This is why I like @eiten 's solution.) I hope it's all working for you again. OSD

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