Integration doesn't start after update

[pksoft585]

Pylontech BMS integration doesn't start:

2025-11-26 19:51:54.413 ERROR (MainThread) [homeassistant.config_entries] Error setting up entry Pylontech BMS for pylontech
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 761, in __async_setup_with_context
    result = await component.async_setup_entry(hass, self)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/pylontech/__init__.py", line 61, in async_setup_entry
    await coordinator.detect_sensors()
  File "/config/custom_components/pylontech/coordinator.py", line 87, in detect_sensors
    pwr = await self.pylontech.pwr()
          ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/pylontech/pylontech.py", line 455, in pwr
    return PwrCommand(await self._exec_cmd("pwr"))
  File "/config/custom_components/pylontech/pylontech.py", line 244, in __init__
    self.avg_temp = Temp("Average temperature").set(lines[0].split()[2])
                                                    ~~~~~~~~~~~~~~~~^^^
IndexError: list index out of range

[mletenay]

Can you provide the text output of the 'pwr' command ?
Enable DEBUG on the integration, it should log them

[pksoft585]

Can I use log from esphome?

[11:03:24.996][D][sensor:133]: 'Uptime': Sending state 561697.18750 s with 0 decimals of accuracy
[11:03:28.318][D][stream_server:085]: New client connected from 192.168.1.5
[11:03:28.320][D][binary_sensor:041]: 'Pylontech serial server': New state is ON
[11:03:28.341][D][uart_debug:158]: >>> "pwr\r"
[11:03:28.352][D][uart_debug:158]: <<< "pwr\n"
[11:03:28.364][D][uart_debug:158]: <<< "\r@\r\r\n"
[11:03:28.376][D][uart_debug:158]: <<< "AverageTempr: 18183       \r\r\n"
[11:03:28.391][D][uart_debug:158]: <<< "Volt   Curr   Tempr  BTlow  BThigh BVlow  BVhigh UTlow  UThigh UVlow  UVhigh Base.St  Volt.St  Curr.St  Temp.St  CoulombAH               Time         "
[11:03:28.404][D][uart_debug:158]: <<< "        B.V.St   B.T.St   U.V.St   U.T.St   Err Code\r\r\n"
[11:03:28.438][D][uart_debug:158]: <<< "196648 -204   26000  17000  19000  3183   3286   25000  26000  48979  49249  Dischg   Normal   Normal   Normal   11%            5500 mAH 2025-11-27 18"
[11:03:28.450][D][uart_debug:158]: <<< ":08:18  Normal   Normal   Normal   Normal   0x0\r\n"
[11:03:28.462][D][uart_debug:158]: <<< "\rCommand completed successfully\r\n"
[11:03:28.474][D][uart_debug:158]: <<< "\r$$\r\n"
[11:03:28.489][D][uart_debug:158]: <<< "\rpylon>"
[11:03:28.520][D][uart_debug:158]: >>> "unit\r"
[11:03:28.531][D][uart_debug:158]: <<< "unit\n"
[11:03:28.543][D][uart_debug:158]: <<< "\r@\r\r\n"
[11:03:28.556][D][uart_debug:158]: <<< "AverageTempr: 18183       \r\r\n"
[11:03:28.570][D][uart_debug:158]: <<< "Index  Volt   Curr   Tempr  BTlow  BThigh BVlow  BVhigh Base.St  Volt.St  Temp.St  CoulombAH               Time                \r\r\n"
[11:03:28.586][D][uart_debug:158]: <<< "1      49247  -204   25000  17000  18000  3281   3286    Dischg   Normal   Normal   60%           30099 mAH 2025-11-27 18:08:20 \r\r\n"
[11:03:28.600][D][uart_debug:158]: <<< "2      49241  -204   25000  17200  18000  3279   3285    Dischg   Normal   Normal   60%           29862 mAH 2025-11-27 18:08:20 \r\r\n"
[11:03:28.619][D][uart_debug:158]: <<< "3      48980  -204   25000  18000  19000  3184   3284    Dischg   Normal   Normal   11%            5500 mAH 2025-11-27 18:08:20 \r\r\n"
[11:03:28.633][D][uart_debug:158]: <<< "4      49180  -204   26000  19000  19000  3221   3285    Dischg   Normal   Normal   60%           30099 mAH 2025-11-27 18:08:20 \r\n"
[11:03:28.645][D][uart_debug:158]: <<< "\rCommand completed successfully\r\n"
[11:03:28.657][D][uart_debug:158]: <<< "\r$$\r\n"
[11:03:28.672][D][stream_server:167]: Client 192.168.1.5 disconnected
[11:03:28.676][D][binary_sensor:041]: 'Pylontech serial server': New state is OFF
[11:03:28.774][D][uart_debug:158]: <<< "\rpylon>"

[mletenay]

I don't see a problem in the code.
Could you please reload the the integration to older commit which was last working for you and then find out which commit broke it ?

[mletenay]

Ok, I've noticed your firmware producing slightly different formatting (no space before ":").
I've made the code bit more robust, so try the most recent commit ...

[pksoft585]

Another error on latest commit:

2025-11-29 20:32:56.780 ERROR (MainThread) [homeassistant.config_entries] Error setting up entry Pylontech BMS for pylontech
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/config_entries.py", line 761, in __async_setup_with_context
result = await component.async_setup_entry(hass, self)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/pylontech/init.py", line 61, in async_setup_entry
await coordinator.detect_sensors()
File "/config/custom_components/pylontech/coordinator.py", line 87, in detect_sensors
pwr = await self.pylontech.pwr()
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/pylontech/pylontech.py", line 477, in pwr
return PwrCommand(await self._exec_cmd("pwr"))
File "/config/custom_components/pylontech/pylontech.py", line 267, in init
self.dc_voltage = Voltage("DC Voltage").setValue(lines[1])
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
File "/config/custom_components/pylontech/pylontech.py", line 165, in setValue
self.set(source[source.index(":") + 1 :], divider)
~~~~~~~~~~~~^^^^^
ValueError: substring not found

[pksoft585]

Maybe the problem is in this line: "AverageTempr: 18183 \r\r\n". There are no DC Voltage and Bat Voltage, resp. there are empty lines.

[jirkanvck]

Good evening, Martin, I'm joining in, I still have the same problem even after the update b289be1. Thanks for the help. Jirkan

Logger: homeassistant.config_entries
Zdroj: config_entries.py:761
První výskyt: 19:29:12 (1 výskyt)
Naposledy logováno: 19:29:12

Error setting up entry Pylontech BMS for pylontech
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/config_entries.py", line 761, in __async_setup_with_context
result = await component.async_setup_entry(hass, self)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/pylontech/init.py", line 61, in async_setup_entry
await coordinator.detect_sensors()
File "/config/custom_components/pylontech/coordinator.py", line 91, in detect_sensors
bat = await self.pylontech.bat()
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/pylontech/pylontech.py", line 467, in bat
return BatCommand(await self._exec_cmd("bat"))
File "/config/custom_components/pylontech/pylontech.py", line 318, in init
self.values.append(BatValues(line, int(cell / 15)))
~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/pylontech/pylontech.py", line 345, in init
self.charge_wh_perc = Percent("Cell charge Wh %").set(chunks[8])
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
File "/config/custom_components/pylontech/pylontech.py", line 120, in set
self.value = int(source.replace("%", ""))
~~~^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: invalid literal for int() with base 10: 'N'

[mletenay]

The parser is quite stupid and expects specific output.
And my firmware is obviously producing slightly different output.
I improved it a bit again, try the latest commit now.

[pksoft585]

Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/config_entries.py", line 761, in __async_setup_with_context
result = await component.async_setup_entry(hass, self)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/pylontech/init.py", line 61, in async_setup_entry
await coordinator.detect_sensors()
File "/config/custom_components/pylontech/coordinator.py", line 87, in detect_sensors
pwr = await self.pylontech.pwr()
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/pylontech/pylontech.py", line 480, in pwr
return PwrCommand(await self._exec_cmd("pwr"))
File "/config/custom_components/pylontech/pylontech.py", line 290, in init
self.charge_wh_perc = Percent("Charge Wh %").set(chunks[18])
~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
File "/config/custom_components/pylontech/pylontech.py", line 120, in set
self.value = int(source.replace("%", ""))
~~~^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: invalid literal for int() with base 10: '2025-12-02'

[mletenay]

OK, you version does not provide values in WH (neither pwr nor unit commands).
Fixed, try now, it should work.
But it may fail later on bat command, I would need log of that in that case ...

[jirkanvck]

Good Morning, I still have the same problem even after the update. I have added log from ESP connecting.
I have been running your project for a long time without any errors, until the HA 2025.11 update.
I apologize for the inconvenience and I am grateful for your time and quick response with correction. Can I help with the solution?

GW10K-ET
Update Firmware
Current Version
V1.2.1.18(Boot:V1.1.4)
BMS
Inverter serial numberP225023D12260872
Current version:MW3_15_B505_1.31

Logger: homeassistant.config_entries
Zdroj: config_entries.py:761
První výskyt: 06:47:46 (1 výskyt)
Naposledy logováno: 06:47:46

Error setting up entry Pylontech BMS for pylontech
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/config_entries.py", line 761, in __async_setup_with_context
result = await component.async_setup_entry(hass, self)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/pylontech/init.py", line 61, in async_setup_entry
await coordinator.detect_sensors()
File "/config/custom_components/pylontech/coordinator.py", line 91, in detect_sensors
bat = await self.pylontech.bat()
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/pylontech/pylontech.py", line 480, in bat
return BatCommand(await self._exec_cmd("bat"))
File "/config/custom_components/pylontech/pylontech.py", line 331, in init
self.values.append(BatValues(line, int(cell / 15)))
~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
File "/config/custom_components/pylontech/pylontech.py", line 357, in init
self.charge_ah = ChargeAh("Cell charge Ah").set(chunks[7])
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
File "/config/custom_components/pylontech/pylontech.py", line 178, in set
self.value = int(source) / divider
~~~^^^^^^^^
ValueError: invalid literal for int() with base 10: '129%'

ESP Log
[08:44:24.850][D][stream_server:109]: New client connected from 192.168.79.10
[08:44:24.851][D][binary_sensor:041]: 'Connected': New state is ON
[08:44:25.160][E][stream_server:138]: Incoming bytes available, but outgoing buffer is full: stream will be corrupted!
[08:44:25.220][W][stream_server:145]: Dropped 128 pending bytes for client 192.168.79.10
[08:44:25.221][E][stream_server:138]: Incoming bytes available, but outgoing buffer is full: stream will be corrupted!
[08:44:25.221][W][stream_server:145]: Dropped 128 pending bytes for client 192.168.79.10
[08:44:25.221][E][stream_server:138]: Incoming bytes available, but outgoing buffer is full: stream will be corrupted!
[08:44:25.221][W][stream_server:145]: Dropped 92 pending bytes for client 192.168.79.10
[08:44:25.339][E][stream_server:138]: Incoming bytes available, but outgoing buffer is full: stream will be corrupted!
.
.
[08:45:45.102][W][stream_server:145]: Dropped 50 pending bytes for client 192.168.79.10
[08:45:45.102][E][stream_server:138]: Incoming bytes available, but outgoing buffer is full: stream will be corrupted!
[08:45:45.102][W][stream_server:145]: Dropped 123 pending bytes for client 192.168.79.10
[08:45:45.103][E][stream_server:138]: Incoming bytes available, but outgoing buffer is full: stream will be corrupted!
[08:45:45.103][W][stream_server:145]: Dropped 55 pending bytes for client 192.168.79.10
[08:45:45.114][E][stream_server:138]: Incoming bytes available, but outgoing buffer is full: stream will be corrupted!
[08:45:45.122][D][stream_server:211]: Client 192.168.79.10 disconnected
[08:45:45.122][D][binary_sensor:041]: 'Connected': New state is OFF
INFO Processing unexpected disconnect from ESPHome API for pylontech @ 192.168.79.17
WARNING Disconnected from API
INFO Successfully resolved pylontech @ 192.168.79.17 in 0.001s
INFO Successfully connected to pylontech @ 192.168.79.17 in 0.006s
INFO Successful handshake with pylontech @ 192.168.79.17 in 2.611s
[08:54:21.975][D][api:161]: Accept 192.168.79.10
[08:54:23.126][D][api.connection:1386]: Home Assistant 2025.11.3 (192.168.79.10) connected

[pksoft585]

I think, your @jirkanvck main problem is on esphome site. Did you update Stream server for ESPHome?

[jirkanvck]

I think yes, I tried the newly downloaded both external_components: - source: github://oxan/esphome-stream-server # - source: github://mletenay/esphome-stream-server. Could I somehow objectively verify this? J

[pksoft585]

I tried both link and with both it works. It looks as a problem with serial component. Do you have set debug in uart?
This is my working code:

esphome:
  name: "lilly-go-eth-lite-02"
  friendly_name: Pylontech Monitor

esp32:
  board: esp-wrover-kit
  framework:
    type: esp-idf

external_components:
#  - source: github://oxan/esphome-stream-server
  - source: github://mletenay/esphome-stream-server

# Enable logging
logger:
#  level: VERBOSE
#  baud_rate: 0

# Enable Home Assistant API
api:
  encryption:
    key: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

ota:
  platform: esphome
  password: !secret esphome_ota_password

ethernet:
  type: RTL8201
  mdc_pin: GPIO23
  mdio_pin: GPIO18
  clk_mode: GPIO0_IN
  phy_addr: 0
  power_pin: GPIO12
  manual_ip:
    static_ip: 192.168.1.254
    gateway: 192.168.1.1
    subnet: 255.255.255.0
    dns1: 192.168.1.1
    dns2: 1.1.1.1

# Enable Web server.
web_server:
  port: 80
  log: false
  version: 3
  local: true
  sorting_groups:
    - id: sorting_group_server
      name: "Server"
      sorting_weight: 10
    - id: sorting_group_akce
      name: "Akce"
      sorting_weight: 90
    - id: sorting_group_info
      name: "Info"
      sorting_weight: 95

# Sync time with Home Assistant.
time:
  - platform: homeassistant
    id: homeassistant_time

stream_server:
  - uart_id: lilly_go_eth_lite_02_uart_pylontech
    port: 6638
    id: lilly_go_eth_lite_02_uart_stream_server

uart:
  - id: lilly_go_eth_lite_02_uart_pylontech
    tx_pin: GPIO13
    rx_pin: GPIO04
    baud_rate: 115200
    rx_buffer_size: 2048
    debug:
      direction: BOTH
      dummy_receiver: false
      after:
        delimiter: "\n"
      sequence:
        - lambda: UARTDebug::log_string(direction, bytes);

switch:
  # Restart switch
  - platform: restart
    name: "Restart"
    id: lilly_go_eth_lite_02_restart_switch
    web_server:
      sorting_weight: 10
      sorting_group_id: sorting_group_akce
  # Restart switch (Safe mode)
  - platform: safe_mode
    name: "Restart (Safe Mode)"
    entity_category: config
    id: lilly_go_eth_lite_02_safe_mode_switch
    web_server:
      sorting_weight: 20
      sorting_group_id: sorting_group_akce

binary_sensor:
  - platform: stream_server
    stream_server: lilly_go_eth_lite_02_uart_stream_server
    connected:
      name: "Pylontech serial server"
      icon: mdi:serial-port
      web_server:
        sorting_weight: 10
        sorting_group_id: sorting_group_server

sensor:
  # Uptime sensor
  - platform: uptime
    name: "Uptime"
    id: lilly_go_eth_lite_02_uptime
    update_interval: 15s
    web_server:
      sorting_weight: 10
      sorting_group_id: sorting_group_info

[jirkanvck]

Thank you very much, I try it today at the evening. Have a nice day J Dne st 3. 12. 2025 9:54 uživatel pksoft585 ***@***.***> napsal:

…

*pksoft585* left a comment (mletenay/home-assistant-pylontech#10) <#10 (comment)> I tried both link and with both it works. It looks as a problem with serial component. Do you have set debug in uart? This is my working code: esphome: name: "lilly-go-eth-lite-02" friendly_name: Pylontech Monitor esp32: board: esp-wrover-kit framework: type: esp-idf external_components:# - source: github://oxan/esphome-stream-server - source: github://mletenay/esphome-stream-server # Enable logginglogger:# level: VERBOSE# baud_rate: 0 # Enable Home Assistant APIapi: encryption: key: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" ota: platform: esphome password: !secret esphome_ota_password ethernet: type: RTL8201 mdc_pin: GPIO23 mdio_pin: GPIO18 clk_mode: GPIO0_IN phy_addr: 0 power_pin: GPIO12 manual_ip: static_ip: 192.168.1.254 gateway: 192.168.1.1 subnet: 255.255.255.0 dns1: 192.168.1.1 dns2: 1.1.1.1 # Enable Web server.web_server: port: 80 log: false version: 3 local: true sorting_groups: - id: sorting_group_server name: "Server" sorting_weight: 10 - id: sorting_group_akce name: "Akce" sorting_weight: 90 - id: sorting_group_info name: "Info" sorting_weight: 95 # Sync time with Home Assistant.time: - platform: homeassistant id: homeassistant_time stream_server: - uart_id: lilly_go_eth_lite_02_uart_pylontech port: 6638 id: lilly_go_eth_lite_02_uart_stream_server uart: - id: lilly_go_eth_lite_02_uart_pylontech tx_pin: GPIO13 rx_pin: GPIO04 baud_rate: 115200 rx_buffer_size: 2048 debug: direction: BOTH dummy_receiver: false after: delimiter: "\n" sequence: - lambda: UARTDebug::log_string(direction, bytes); switch: # Restart switch - platform: restart name: "Restart" id: lilly_go_eth_lite_02_restart_switch web_server: sorting_weight: 10 sorting_group_id: sorting_group_akce # Restart switch (Safe mode) - platform: safe_mode name: "Restart (Safe Mode)" entity_category: config id: lilly_go_eth_lite_02_safe_mode_switch web_server: sorting_weight: 20 sorting_group_id: sorting_group_akce binary_sensor: - platform: stream_server stream_server: lilly_go_eth_lite_02_uart_stream_server connected: name: "Pylontech serial server" icon: mdi:serial-port web_server: sorting_weight: 10 sorting_group_id: sorting_group_server sensor: # Uptime sensor - platform: uptime name: "Uptime" id: lilly_go_eth_lite_02_uptime update_interval: 15s web_server: sorting_weight: 10 sorting_group_id: sorting_group_info — Reply to this email directly, view it on GitHub <#10 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AO4DYTVJSRGV4I3S22AQUYT372QM5AVCNFSM6AAAAACNJLONC6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTMMBVG42DCMRRHA> . You are receiving this because you were mentioned.Message ID: ***@***.***>