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Raj Laud asked

Putting Lynx Smart BMS in standby via MQTT on Victron Cerbo

I use a Victron Cerbo and have it set up to communicate with Home Assistant using MQTT. Generally this works great. However, I'm having trouble figuring out the appropriate topic to use to put a Lynx Smart BMS in standby. I tried "W/[serial]/Battery/0/SystemSwitch" but it did not work - apparently this is read only. I poked around with dbus-spy but couldn't find anything there either.

I can put the Lynx Smart BMS in standby from the Cerbo menu, so it seems that the Cerbo has the ability to tell the BMS to go into standby/turn on. Any idea what the right topic would be?

cerbo gxlynx bms
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Raj Laud answered ·

I figured it out. The correct topic is "W/[serial]/Battery/0/Mode".

3 = on

4 = off (if you set this you can't communicate over MQTT anymore, so probably a bad idea)

252 = standby (can turn back on over MQTT)

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