I found that the MQTT command status_update on topic <topic_prefix>/command/switch:0 triggers a switch action as undesired side-effect. Besides publishing its current status, the switch turns off immediately.
Therefore a cannot use the command for periodically triggering status/power measurement updates.
To me it looks like a firmware bug -- but don't know where to report, so using this forum.
This is detailed device info:
"id": "shellyplus1pm-b0b21c1a6c78"
"mac": "B0B21C1A6C78",
"slot": 0,
"key": "xxxxxxxxxx",
"batch": "2307-Broadwell",
"fw_sbits": "04",
"model": "SNSW-001P16EU",
"gen": 2,
"fw_id": "20230803-125304/1.0.0-gaec0744",
"ver": "1.0.0",
"app": "Plus1PM",
"auth_en": true,
See also attached screenshot in case it's not clear what I have tried.
Best regards,
Norbert