Hi,
giving some additional information here - some of the commands I got with Wireshark decoding the tcpdump and listening the BRP069A62 websocket traffic.
Indeed, the websocket is the only option there and sending JSON strings.
As for my case, as the Daikin Altherma is in LWT control mode (not Room Temperature), there are no commands seen to monitor/control LWT configuration. So for my case, I only get to play with my Domestic Hot Water values. Below are some commands I harvested out from the websocket traffic. This is not a final list, there was a lot about as well about DWH schedule etc, yet not being the main interest I omitted it.
{"m2m:rqp":{"op":2,"to":"/[0]/MNAE/1/Sensor/TankTemperature/la","fr":"/TarmoTest","rqi":"xijub"}}
{"m2m:rqp":{"op":2,"to":"/[0]/MNAE/1/Operation/TargetTemperature/la","fr":"/TarmoTest","rqi":"yssyq"}}
{"m2m:rqp":{"op":2,"to":"/[0]/MNAE/1/Operation/Power/la","fr":"/TarmoTest","rqi":"umufn"}}
{"m2m:rqp":{"op":2,"to":"/[0]/MNAE/1/Operation/OperationMode/la","fr":"/TarmoTest","rqi":"nygjn"}}
{"m2m:rqp":{"op":2,"to":"/[0]/MNAE/1/Operation/TargetTemperature/la","fr":"/TarmoTest","rqi":"yssyq"}}
{"m2m:rqp":{"op":2,"to":"/[0]/MNAE/1/Operation/Powerful/la","fr":"/S3006ad02-d2f5-4cae-9b17-9be43d6f6408","rqi":"bswjp"}}
How to play with it - google for “websocket client”, connect to ws://192.168.2.4/mca (or any other IP your Daikin LAN device is running). Note the /mca in the end
If you are interested in the Python code connceting and gathering some parameter value, let me know.
Br
Tarmo