Suddenly after an HA update i get no sensor data anymore

[se-O-matic]

Hello,
After installing the Core Update 2026.7.4 HA did not received any data from all my "MySensors" sensors.

I use the serial gateway on a raspberry pi 3. The connection to this seems to work:

"2026-08-04 17:45:39.160 INFO (MainThread) [mysensors.transport] Connected to Serial<id=0x7f54ec9a50, open=True>(port='/dev/ttyUSB0', baudrate=38400, bytesize=8, parity='N', stopbits=1, timeout=0, xonxoff=False, rtscts=False, dsrdtr=False)"

I get no more messages from mysensors after the startup.
I tried a reboot as well as a shut down and a complete power cycle.
I tried to repower the sensors as well. But this doesnt work either.

Sometimes, about 2 to 3 times per day, i get a message like this:

2026-08-05 22:29:42.054 DEBUG (MainThread) [mysensors.transport] Receiving ��D������D��w���^y
2026-08-05 22:29:42.056 WARNING (MainThread) [mysensors.message] Error decoding message from gateway, bad data received: ��D������D��w���^y
2026-08-05 22:29:42.057 WARNING (MainThread) [mysensors] Not a valid message: not enough values to unpack (expected 5, got 0)

I tested the serial gateway on my pc. The sensors appear in the serial console:

8;0;1;0;0;21.59<\n>
8;1;1;0;1;58.98<\n>
8;255;3;0;0;85<\n>
5;0;1;0;0;23.40<\n>
2;0;1;0;0;19.05<\n>
2;1;1;0;1;68.34<\n>
2;255;3;0;0;63<\n>

I am running out of ideas. On github i also created a issue.
Has someone an idea how can i debug or fix this?
As last opportunity i can build a MQTT-Gateway.

regards,
Sebastian

[nagelc]

I'm not very smart at Home Assistant, but 2 things you could look at:
Your baud rate is being reported as 38400. My gateways run at 115200. I'm not sure how HA determines what the baud rate should be. Edit: for 8 MHz Arduino, 38400 baud rate is correct, so that probably isn't it.
In Home Assistant>Settings>System>Hardware, pick the System Hardware tab. That will show all the ports and what is attached to them. Maybe there will be a clue there.