How to advertise with specific 128bit uuid by pc-ble-driver-py?

[zhaoyuan]

Hi,

I have met a problem that I try to advertise nRF52840 dongle in pc-ble-driver-py. However, connection is not built from this command:

BASE_UUID = [0x6E, 0x40, 0x00, 0x01, 0xB5, 0xA3, 0xF3, 0x93,
                                 0xE0, 0xA9, 0xE5, 0x0E, 0x24, 0xDC, 0xCA, 0x9E]
adv_data = BLEAdvData(service_128bit_uuid_complete=BASE_UUID)

The uuid is uart over ble which is used in nRFConnect desktop. And we can connect through this application.

I wonder to know how to advertise with specific 128bit uuid by pc-ble-driver-py. Thank you!

[zhaoyuan]

I find that this code can not change the complete list of 128-bit service uuids. Is there any function which can change the uuid of the advertising device?

[Sigurd]

Hi,

This post might be helpful to solve this:

 Adding custome characterstics using pc-ble-driver-py 

[zhaoyuan]

Hi Sigurd,

This function self.adapter.driver.ble_vs_uuid_add still doesn't work. Maybe the difference is that I use nRF52840 as slave by adveristing it. 

class HRCollector(BLEDriverObserver, BLEAdapterObserver):
    def __init__(self, adapter):
        super(HRCollector, 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
        from pc_ble_driver_py.ble_driver import BLEUUIDBase
        self.nus_base = BLEUUIDBase([
            0x6e, 0x40, 0x00, 0x00, 0xb5, 0xa3, 0xf3, 0x93, 0xe0, 0xa9, 0xe5, 0x0e, 0x24, 0xdc, 0xca, 0x9e
        ])

    def open(self):

        self.adapter.driver.open()
        if config.__conn_ic_id__.upper() == "NRF51":
            self.adapter.driver.ble_enable(
                BLEEnableParams(
                    vs_uuid_count=1,
                    service_changed=0,
                    periph_conn_count=0,
                    central_conn_count=1,
                    central_sec_count=0,
                )
            )
        elif config.__conn_ic_id__.upper() == "NRF52":

            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()
            self.adapter.driver.ble_vs_uuid_add(self.nus_base)
        from pc_ble_driver_py.ble_driver import BLEUUIDBase
        # BASE_UUID = [0x6E, 0x40, 0x00, 0x01, 0xB5, 0xA3, 0xF3, 0x93,
        #                          0xE0, 0xA9, 0xE5, 0x0E, 0x24, 0xDC, 0xCA, 0x9E]
        # adv_data = BLEAdvData(service_128bit_uuid_complete=BASE_UUID)
        adv_data = BLEAdvData(complete_local_name="pc_ble_driver_py")
        self.adapter.driver.ble_gap_adv_data_set(adv_data)

        self.adapter.driver.ble_gap_adv_start()
        scan_duration = 60
        try:
            new_conn = self.conn_q.get(timeout=scan_duration)
            self.adapter.enable_notification(
                new_conn, BLEUUID(Uart_Tx_uuid), uart_tx_handle
            )
            return new_conn
        except Empty:
            print(f"No heart rate collector advertising with name {TARGET_DEV_NAME} found.")
            return None
        # return None

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

    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)

[Sigurd]

zhaoyuan said:

This function self.adapter.driver.ble_vs_uuid_add still doesn't work.

What do you mean by "doesn't work"? Are you getting any errors?

[zhaoyuan]

Hi,

I don't get any error. But the uuid has not changed, which can be seen in complete list of 128-bit service uuids.

[Sigurd]

Hi,

Looks correct to me. Note that it's displayed in the reverse order v.s. how it's defined in BLEUUIDBase (this is expected)

[zhaoyuan]

Hi Sigurd,

I reverse the uuid and it works. Thank you!