Disconnected: 0 BLEHci.remote_user_terminated_connection [using pc_ble_driver_py]

[voldemort]

Hello,

I am using the nordic nRF52840-DK and trying to connect to a nRF52840-Dongle and sending/receiving data to custom services and characteristics using pc_ble_driver_py. I modified the heart rate collector.

But the problem is that when I am connected to the Dongle the connection last 25 to 30 secondes and I receive a message : "Disconnected: 0 BLEHci.remote_user_terminated_connection" and the error message is : "line 477, in write_req attr_handle = self.db_conns[conn_handle].get_char_value_handle(uuid) KeyError: 0". However, when I use the nRF connect mobile/PC version I don't have this problem so I think it is a problem with my code. I check it out if there is some time out equal to like 25_30 secondes but I didn't find any solution.

Could someone help me please to find some solution.

Thanks in advance.

Cordially

Joe

[voldemort]

Fullscreen 6428.nRF_BLE.py Download

from time import sleep
from queue import Queue, Empty
from pc_ble_driver_py.observers import *

global config, BLEDriver, BLEAdvData, BLEEvtID, BLEAdapter, BLEEnableParams, BLEGapTimeoutSrc, BLEUUID, BLEUUIDBase, BLEConfigCommon, BLEConfig, BLEConfigConnGatt, BLEGapScanParams
from pc_ble_driver_py import config

config.__conn_ic_id__ = "NRF52"

from pc_ble_driver_py.ble_driver import (
    BLEDriver,
    BLEAdvData,
    BLEEvtID,
    BLEEnableParams,
    BLEGapTimeoutSrc,
    BLEUUID,
    BLEUUIDBase,
    BLEGapScanParams,
    BLEConfigCommon,
    BLEConfig,
    BLEConfigConnGatt,
)
# noinspection PyUnresolvedReferences
from pc_ble_driver_py.ble_adapter import BLEAdapter

# Look at the example below
# E4:3A:4F:B8:C6:FC --> [228, 58, 79, 184, 198, 252]
TARGET_PEER_ADDR = [216, 96, 176, 219, 226, 122]
CONNECTIONS = 1
CFG_TAG = 1
nrf_sd_ble_api_ver = config.sd_api_ver_get()


class HR(BLEDriverObserver, BLEAdapterObserver):

    def __init__(self, adapter):
        super(HR, self).__init__()
        self.adapter = adapter
        self.conn_q = Queue()
        self.adapter.observer_register(self)
        self.adapter.driver.observer_register(self)
        self.adapter.default_mtu = 250

    def open(self):
        self.adapter.driver.open()
        gatt_cfg = BLEConfigConnGatt()
        gatt_cfg.att_mtu = self.adapter.default_mtu
        gatt_cfg.tag = CFG_TAG
        self.adapter.driver.ble_cfg_set(BLEConfig.conn_gatt, gatt_cfg)
        self.adapter.driver.ble_enable()

    def close(self):
        self.adapter.driver.close()

    def connect_and_discover(self):
        scan_duration = 180
        params = BLEGapScanParams(interval_ms=200, window_ms=150, timeout_s=scan_duration)

        self.adapter.driver.ble_gap_scan_start(scan_params=params)

        try:
            new_conn = self.conn_q.get(timeout=scan_duration)
            self.adapter.service_discovery(new_conn)
            for s in self.adapter.db_conns[new_conn].services:
                print(str(s))
                for c in s.chars:
                    print(str(c))

            return new_conn
        except Empty:
            print("No Device found.")
            return None

    def on_gap_evt_connected(self, ble_driver, conn_handle, peer_addr, role, conn_params):
        print("New connection: {}".format(conn_handle))
        self.conn_q.put(conn_handle)

    def on_gap_evt_disconnected(self, ble_driver, conn_handle, reason):
        print("Disconnected: {} {}".format(conn_handle, reason))

    def on_gap_evt_adv_report(self, ble_driver, conn_handle, peer_addr, rssi, adv_type, adv_data):
        if BLEAdvData.Types.complete_local_name in adv_data.records:
            dev_name_list = adv_data.records[BLEAdvData.Types.complete_local_name]

        elif BLEAdvData.Types.short_local_name in adv_data.records:
            dev_name_list = adv_data.records[BLEAdvData.Types.short_local_name]

        else:
            return
        print(dev_name_list)
        dev_name = "".join(chr(e) for e in dev_name_list)
        address_string = ":".join("{0:02X}".format(b) for b in peer_addr.addr)
        print(f"Received advertisment report, address: {address_string}, device_name: {dev_name}")
        if peer_addr.addr == TARGET_PEER_ADDR:
            self.adapter.connect(peer_addr, tag=1)

    def on_notification(self, ble_adapter, conn_handle, uuid, data):
        if len(data) > 32:
            data = "({}...)".format(data[0:10])
        print("Connection: {}, {} = {}".format(conn_handle, uuid, data))
        print("NUS_RX: " + ''.join(map(chr, data)))


def main(selected_serial_port):
    print("Serial port used: {}".format(selected_serial_port))
    driver = BLEDriver(serial_port=selected_serial_port, auto_flash=False, baud_rate=1000000, log_severity_level="info")
    adapter = BLEAdapter(driver)
    collector = HR(adapter)
    collector.open()
    conn = collector.connect_and_discover()

    if conn is not None:
        while True:
            pass

    collector.close()


if __name__ == "__main__":
    main("COM9")  # for me it is COM9

You can see this example below in the file for more clarification.

[Kenneth]

Disconnected: 0 BLEHci.remote_user_terminated_connectio

This means that  sd_ble_gap_disconnect() was called on the peer, with the reason BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION. If you can debug your peer you should be able to find where this is called.

Kenneth

[voldemort]

I searched in debugging mode but I didn't found that the function was called. However, on the peer I receive the messages below :

ERROR:pc_ble_driver_py.ble_driver:Exception: MTU exchange reply failed. Common causes are: missing att_mtu setting in ble_cfg_set, different config tags used in ble_cfg_set and adv_start.
ERROR:pc_ble_driver_py.ble_driver:<FrameSummary file C:xxxx\lib\site-packages\pc_ble_driver_py\ble_driver.py, line 2701 in ble_event_handler_sync>
ERROR:pc_ble_driver_py.ble_driver:<FrameSummary file C:xxxx\lib\site-packages\pc_ble_driver_py\ble_adapter.py, line 772 in on_gatts_evt_exchange_mtu_request>
ERROR:pc_ble_driver_py.ble_driver:

Thanks

Joe

[Kenneth]

It should be possible to search through your project for sd_ble_gap_disconnect(), I don't expect it is used many places.

Looking at your pc ble driver log it may seem realted to MTU settings, you can for test simply comment out on_connected_evt() that is called in nrf_ble_gatt_on_ble_evt() from nrf_ble_gatt.c. This is far fetched, but could be worth a try.

Do you by any chance have an on-air sniffer log (e.g. nrf sniffer)?

Kenneth

[voldemort]

I will try to find a sniffer and comment the function on_connected_evt() . But could you please try to lunch my code in the attachements to see what will happens.

Thanks

Joe