Do we need a delay after connecting before sending modbus messages?

[canton7]

I'm seeing some some messages in the Facebook group saying that people connecting a lan cable directly to the inverter with StealthChesnut's integration need delay: 1 in their config, to avoid random inverter crashes.

Do we need to emulate this?

On a related note, my W610 seems to always fail the first request after a connection, so perhaps that's related.

[paultweedy77]

I've had this running directly from inverter LAN port for a couple of days and have had a couple of inverter crashes/restarts so far.
Oddly enough they've coincided with me either mucking around with settings in HA.

In line with that advice from the Facebook group, I've changed in modbus_client.py:

self._poll_delay = 30 / 1000 if self._config_type == SERIAL else 0
to
self._poll_delay = 30 / 1000 if self._config_type == SERIAL else 1

which will do a 1s delay before each TCP modbus poll - will see if this results in any greater stability.

[paultweedy77]

Quick update - more stable, HA changes don’t seem to crash the inverter, but the inverter is still crashing every 4-5 days for no obvious reason.

Time for me to move to RS485 I think. Waveshare on order.

[jamesog]

I moved from LAN to RS485 last week (see #235) and haven't had a crash since.

[canton7]

Quick update - more stable, HA changes don’t seem to crash the inverter, but the inverter is still crashing every 4-5 days for no obvious reason.

@paultweedy77 So your conclusion is that adding a delay there does help?

[paultweedy77]

Helps to stop HA changes crashing the inverter, yes. However random crashes do still happen (and don't happen when the integration is disabled). I have start the process to move to RS485 as a result (but that isn't going so well.. more in a new topic)

[canton7]

Cool thanks, I've included that in 1.5.3b5.