unable to connect to Inverter using TCP (WiFi-RS485)

[LionBS76]

System Health details

System Information

version	core-2024.9.3
installation_type	Home Assistant OS
dev	false
hassio	true
docker	true
user	root
virtualenv	false
python_version	3.12.4
os_name	Linux
os_version	6.6.46-haos
arch	x86_64
timezone	Europe/Kyiv
config_dir	/config

Home Assistant Community Store

GitHub API	ok
GitHub Content	ok
GitHub Web	ok
HACS Data	ok
GitHub API Calls Remaining	5000
Installed Version	2.0.1
Stage	running
Available Repositories	1422
Downloaded Repositories	2

Home Assistant Cloud

logged_in	false
can_reach_cert_server	ok
can_reach_cloud_auth	ok
can_reach_cloud	ok

Home Assistant Supervisor

host_os	Home Assistant OS 13.1
update_channel	stable
supervisor_version	supervisor-2024.09.1
agent_version	1.6.0
docker_version	26.1.4
disk_total	30.8 GB
disk_used	4.5 GB
healthy	true
supported	true
host_connectivity	true
supervisor_connectivity	true
ntp_synchronized	true
virtualization	kvm
board	ova
supervisor_api	ok
version_api	ok
installed_addons	Get HACS (1.3.1)

Dashboards

dashboards	2
resources	0
views	1
mode	storage

Recorder

oldest_recorder_run	18 вересня 2024 р. о 20:07
current_recorder_run	28 вересня 2024 р. о 16:21
estimated_db_size	20.15 MiB
database_engine	sqlite
database_version	3.45.3

Checklist

• [X] I have enabled debug logging for my installation.
• [X] I have filled out the issue template to the best of my ability.
• [X] This issue only contains 1 issue (if you have multiple issues, open one issue for each issue).
• [X] This issue is not a duplicate issue of any previous issues..

Describe the issue

Beforehand thanks for Your work!!! :)

I have invertor Must PV18-3224 that I want to monitor with HA. HA and Invertor are on some distance from each other so I can't connect it directly by USB Serial cable. To connect to Invertor remotely I use handmade WiFi-to-Serial adaptor (ESP-01 + esp-link software on it + rs485-to-UART adaptor). I can use SolarPowerMonitor (origin software from Must) and HW Virtual Serial Port software, on PC where SolarMonitor installed, to connect to my ESP and monitor Invertor.

So, my handmade adaptor shouldn't be the issue because origin soft SolarPowerMonitor is working fine.

I added Must Plugin to HA. When I try to add Invertor device by TCP (use IP of ESP) that doesn't work.

My handmade WiFi-to-Serial like the one you used before (on DIN rail) in your post

On the ESP (esp-link software) I can see some Debug. When using Virtual Serial Port and origin Solar Monitor I see in log that soft make one connection (suppose 19200 baud) then close it. After that make one new connection and communicate through it all time.

Your HA Must plugin makes 5 connections and didn't close them. And Esp-link soft can't make more simultaneous connections.

Reproduction steps

1. Connect WiFi-to-Serial to Must Invertor
2. Add Invrtor device by TCP option into HA Must plugin
3. Doesn't add any devices
4. Using the same TCP info for connecting origin software Solar Power Monitor thiough Virtual Serial Port works fine ...

Debug logs

From HA log:
2024-09-28 17:21:34.991 ERROR (MainThread) [custom_components.must_inverter] error reading modbus data at address 15201: Exception Response(166, 38, None)
2024-09-28 17:21:42.996 ERROR (MainThread) [custom_components.must_inverter] error reading modbus data at address 20000
Traceback (most recent call last):
  File "/config/custom_components/must_inverter/__init__.py", line 239, in read_modbus_data
    response = await self._client.read_holding_registers(address=start, count=count, slave=0x04)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pymodbus/client/base.py", line 175, in async_execute
    raise ModbusIOException(
pymodbus.exceptions.ModbusIOException: Modbus Error: [Input/Output] ERROR: No response received after 3 retries
2024-09-28 17:21:46.010 ERROR (MainThread) [custom_components.must_inverter] error reading modbus data at address 20101
Traceback (most recent call last):
  File "/config/custom_components/must_inverter/__init__.py", line 239, in read_modbus_data
    response = await self._client.read_holding_registers(address=start, count=count, slave=0x04)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pymodbus/client/base.py", line 167, in async_execute
    resp = await asyncio.wait_for(
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/asyncio/tasks.py", line 520, in wait_for
    return await fut
           ^^^^^^^^^
pymodbus.exceptions.ConnectionException: Modbus Error: [Connection] Connection lost during request
2024-09-28 17:21:46.013 ERROR (MainThread) [custom_components.must_inverter] error reading modbus data at address 25201
Traceback (most recent call last):
  File "/config/custom_components/must_inverter/__init__.py", line 239, in read_modbus_data
    response = await self._client.read_holding_registers(address=start, count=count, slave=0x04)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pymodbus/client/base.py", line 167, in async_execute
    resp = await asyncio.wait_for(
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/asyncio/tasks.py", line 520, in wait_for
    return await fut
           ^^^^^^^^^
pymodbus.exceptions.ConnectionException: Modbus Error: [Connection] Connection lost during request

Diagnostics dump

No response