Regulary 85 ° C from Sonoff Basic with DS18x20

[CosmicDuck]

Hello,

Tasmota Version	14.3.0 (release-tasmota)
Erstellungszeitpunkt	2024.10.15 08:22:35
Core-/SDK-Version	2_7_7/2.2.2-dev(38a443e)
Laufzeit	0T00:14:28
Flash-Schreibzyklen	6098 at 0xFB000
Startvorgänge	72
Grund für Neustart	Software/System restart
Startin a view weeks ago regulary all 
…
HTTP API	aktiviert
MQTT Host	192.168.2.18
MQTT Port	1883
MQTT Benutzer	mqtt
MQTT Client	meinwindzelttemperatur
MQTT Topic	MeinWindTemperatur
MQTT Group Topic 1	cmnd/tasmotas/
MQTT Full Topic	cmnd/MeinWindTemperatur/
MQTT Fallback-Topic	cmnd/meinwindzelttemperatur_fb/
MQTT No Retain	deaktiviert
Emulation	keine
ESP Chip ID	12010210 (ESP8285N08)
Flash Chip ID	0x14325E (DOUT)
Größe Flash-Chip	1024 KB
Flash nutzbar	1024 KB
Programmgröße	650 KB
Flash frei	352 KB
Freier Arbeitsspeicher	22,8 KB

since some weeks I get 85°C spikes of the temperatures from my modified Sonoff Basic R2.

OpenHAB-Panel from iobroker shows the spikes (the gap is related because of an network outage between the sites)

I added one internal and 5 external DS18x20 with 2 wire configuration to get the temperatures of all the connected DS18x20.

In the console I found the following lines from the last spike:

{"Time":"1970-01-11T18:35:13","DS18B20-1":{"Id":"0000002A9F90","Temperature":17.3},"DS18B20-2":{"Id":"253D730A6461","Temperature":85.0},"DS18B20-3":{"Id":"8638730A6461","Temperature":85.0},"DS18B20-4":{"Id":"DB1C760A6461","Temperature":85.0},"DS18B20-5":{"Id":"DD5F730A6461","Temperature":85.0},"DS18B20-6":{"Id":"F9BE7D0A6461","Temperature":85.0},"TempUnit":"C"}

It loosk like a problem with the 5 external sensors could be the problem.
But I wonder me why the problem occurs only in a fixed cycle.

I've now changed web log to level 4 so hopefully I get more details.

Maybe the problem occured after an upgrade so after I got more information from the debug I will try to downgrade to an earlier release.

[CosmicDuck]

I tried to downgrade by using the web upgrade procedure with inserting the older binary.
It has not been worked and so it is still 14.3 installed.
But since then and set loglevel to 4 the spikes are gone.

I will come back with details if the spikes are shown again.

[CosmicDuck]

Here the newest screenshot which shows that the problem looks like gone.