API connection issues with ESPHome and Tianpower BMS (ESP32)

ESPHome
1

Hello everyone,
I am trying to integrate a Tianpower Battery Management System (BMS) with ESPHome using the external component from syssi/esphome-tianpower-bms.

Current configuration

substitutions:
  external_components_source: github://syssi/esphome-tianpower-bms@main
  name: esphome-web-568b34
  mac_address: 2C:C6:82:77:40:5C

esphome:
  name: ${name}
  friendly_name: Esp32 Basen
  min_version: 2025.10.3
  project:
    name: "syssi.esphome-tianpower-bms"
    version: 2.0.0

esp32:
  board: esp32dev
  framework:
    type: arduino

external_components:
  - source: ${external_components_source}
    refresh: 0s

logger:
  level: VERY_VERBOSE

api:
  reboot_timeout: 0s

ota:
  platform: esphome

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

esp32_ble_tracker:

ble_client:
  - mac_address: ${mac_address}
    id: client0

tianpower_bms_ble:
  - ble_client_id: client0
    id: bms0
    update_interval: 10s
  • The ESP connects correctly to Wi‑Fi and responds via OTA.
  • The api: section is enabled without encryption (reboot_timeout: 0s).
  • Port 6053 does not respond: Home Assistant cannot connect via API.
  • Serial logs show no obvious errors, but it seems the firmware enters safe mode or BLE prevents the API from starting.
  • With a minimal firmware (Wi‑Fi + API + OTA only), port 6053 opens normally, so the issue appears related to the BLE/Tianpower component.