not able to connect to more then 3 BLE clients

[JanStry]

Hi, i have a problem when i connect more then 3 clients at the same time.
when i manually disconnect one or more working clients the 4th client connects.

here are some logs:

[00:44:21][D][esp-idf:000][BTU_TASK]: W (71132) BT_HCI: btu_hcif_hdl_command_status,opcode:0x200d,status:0x09
[00:44:21][D][esp-idf:000][BTU_TASK]: W (71137) BT_APPL: gattc_conn_cb: if=3 st=0 id=771 rsn=0x100
[00:44:21][D][esp-idf:000][BTU_TASK]: W (71140) BT_APPL: gattc_conn_cb: if=4 st=0 id=772 rsn=0x100
[00:44:21][D][esp-idf:000][BTU_TASK]: W (71152) BT_APPL: gattc_conn_cb: if=5 st=0 id=773 rsn=0x100
[00:44:21][D][esp-idf:000][BTU_TASK]: W (71161) BT_APPL: gattc_conn_cb: if=6 st=0 id=774 rsn=0x100
[00:44:21][W][esp32_ble_client:142]: [2] [A5:C2:37:2A:06:37] Connection failed, status=133

btu_hcif_hdl_command_status,opcode:0x200d,status:0x09:
according to espidf 0x09 error means :" BLE Connection Limit Exceeded"

however i am sure esphome ESP32 can connect to at least 7 BLE devices at the same time...
maybe there is some limiter set in the BLE library?

kind regards

[syssi]

Which ESP32 model do you use? Did you try to re-order the different devices / ble_client connections just for testing?

In the past there was a hard limit at 3 simultaneous connections: esphome/esphome@1a71cc3

Do you use ESP-IDF as platform? Could you share your YAML configuration?

[JanStry]

Hi, im using the ESP32doit devkit v1.
I did not try to reorder the mac addresses..would that make a difference?
compiling with latest ESPHome version 2024.12.2 via CL

this is my YAML config:

---

substitutions:
name: xxx
bms0: "${name} bms0"
bms1: "${name} bms1"
bms2: "${name} bms2"
bms3: "${name} bms3"
device_description: "Monitor and control a Xiaoxiang Battery Management System (JBD-BMS) via BLE"
external_components_source: github://syssi/esphome-jbd-bms@main
bms0_mac_address: A5:C2:37:36:D9:xx
bms1_mac_address: A5:C2:37:36:CA:xx
bms2_mac_address: A5:C2:37:2A:06:xx
bms3_mac_address: A5:C2:37:2A:0A:xx

esphome:
name: ${name}
comment: ${device_description}
min_version: 2024.6.0
project:
name: "syssi.esphome-jbd-bms"
version: 2.0.0

esp32:
board: esp32doit-devkit-v1
framework:
type: esp-idf

external_components:

• source: ${external_components_source}
  refresh: 0s

wifi:
ssid: "xxxxxxxxx"
password: "xxxxxxxx"

ota:
platform: esphome
on_begin:
then:
- switch.turn_off: ble_client_switch1
- switch.turn_off: ble_client_switch2
- switch.turn_off: ble_client_switch3
- switch.turn_off: ble_client_switch0
- logger.log: "BLE connection suspended for OTA update" #added this for smoother OTA uploads

logger:
level: DEBUG
logs:
esp32_ble_tracker: INFO
esp32_ble_client: INFO

api:

esp32_ble_tracker:
scan_parameters:
active: false

ble_client:

• mac_address: ${bms0_mac_address}
  id: client0
• mac_address: ${bms1_mac_address}
  id: client1
• mac_address: ${bms2_mac_address}
  id: client2
• mac_address: ${bms3_mac_address}
  id: client3

jbd_bms_ble:

• id: bms0
  ble_client_id: client0
  update_interval: 5s
• id: bms1
  ble_client_id: client1
  update_interval: 5s
• id: bms2
  ble_client_id: client2
  update_interval: 5s
• id: bms3
  ble_client_id: client3
  update_interval: 5s

binary_sensor:

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms0
  balancing:
  name: "${bms0} balancing"
  charging:
  name: "${bms0} charging"
  discharging:
  name: "${bms0} discharging"
  online_status:
  name: "${bms0} online status"

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms1
  balancing:
  name: "${bms1} balancing"
  charging:
  name: "${bms1} charging"
  discharging:
  name: "${bms1} discharging"
  online_status:
  name: "${bms1} online status"

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms2
  balancing:
  name: "${bms2} balancing"
  charging:
  name: "${bms2} charging"
  discharging:
  name: "${bms2} discharging"
  online_status:
  name: "${bms2} online status"

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms3
  balancing:
  name: "${bms3} balancing"
  charging:
  name: "${bms3} charging"
  discharging:
  name: "${bms3} discharging"
  online_status:
  name: "${bms3} online status"

sensor:

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms0
  power:
  name: "${bms0} power"
  state_of_charge:
  name: "${bms0} state of charge"
  total_voltage:
  name: "${bms0} total voltage"
  average_cell_voltage:
  name: "${bms0} average cell voltage"
  delta_cell_voltage:
  name: "${bms0} delta cell voltage"

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms1
  power:
  name: "${bms1} power"
  state_of_charge:
  name: "${bms1} state of charge"
  total_voltage:
  name: "${bms1} total voltage"
  average_cell_voltage:
  name: "${bms1} average cell voltage"
  delta_cell_voltage:
  name: "${bms1} delta cell voltage"

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms2
  power:
  name: "${bms2} power"
  state_of_charge:
  name: "${bms2} state of charge"
  total_voltage:
  name: "${bms2} total voltage"
  average_cell_voltage:
  name: "${bms2} average cell voltage"
  delta_cell_voltage:
  name: "${bms2} delta cell voltage"

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms3
  power:
  name: "${bms3} power"
  state_of_charge:
  name: "${bms3} state of charge"
  total_voltage:
  name: "${bms3} total voltage"
  average_cell_voltage:
  name: "${bms3} average cell voltage"
  delta_cell_voltage:
  name: "${bms3} delta cell voltage"

text_sensor:

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms0
  errors:
  name: "${bms0} errors"
  operation_status:
  name: "${bms0} operation status"
  device_model:
  name: "${bms0} device model"

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms1
  errors:
  name: "${bms1} errors"
  operation_status:
  name: "${bms1} operation status"
  device_model:
  name: "${bms1} device model"

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms2
  errors:
  name: "${bms2} errors"
  operation_status:
  name: "${bms2} operation status"
  device_model:
  name: "${bms2} device model"

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms3
  errors:
  name: "${bms3} errors"
  operation_status:
  name: "${bms3} operation status"
  device_model:
  name: "${bms3} device model"

switch:

• platform: ble_client
  ble_client_id: client0
  id: ble_client_switch0
  name: "${bms0} enable bluetooth connection"

• platform: ble_client
  ble_client_id: client1
  id: ble_client_switch1
  name: "${bms1} enable bluetooth connection"

• platform: ble_client
  ble_client_id: client2
  id: ble_client_switch2
  name: "${bms2} enable bluetooth connection"

• platform: ble_client
  ble_client_id: client3
  id: ble_client_switch3
  name: "${bms3} enable bluetooth connection"

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms0
  charging:
  name: "${bms0} charging"
  discharging:
  name: "${bms0} discharging"

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms1
  charging:
  name: "${bms1} charging"
  discharging:
  name: "${bms1} discharging"

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms2
  charging:
  name: "${bms2} charging"
  discharging:
  name: "${bms2} discharging"

• platform: jbd_bms_ble
  jbd_bms_ble_id: bms3
  charging:
  name: "${bms3} charging"
  discharging:
  name: "${bms3} discharging"