BLE.active not returning on Nicla Vision

Official Hardware Nicla Family Nicla Vision
1

Hi,
I recently got a Nicla Vision, and I'm trying to get the bluetooth example running.
I'm using OpenMV, and have loaded the example file ble_temperature_1.py, under the Nicla Vision examples.

However, the code seems to be holding at the call to BLE.active(TRUE)

The sample code is below, the line that doesn't pass is line 43:

self._ble.active(True) # not passing this part

OpenMV v4.4.3; MicroPython v1.20-omv; NICLAVISION-STM32H747

I'm unsure how to proceed with debugging this issue, does anyone have thoughts?

Thanks!

# This example demonstrates a simple temperature sensor peripheral.
#
# The sensor's local value updates every second, and it will notify
# any connected central every 10 seconds.

import aioble
import bluetooth
import random
import struct
import time
from ble_advertising import advertising_payload

from micropython import const

_IRQ_CENTRAL_CONNECT = const(1)
_IRQ_CENTRAL_DISCONNECT = const(2)
_IRQ_GATTS_INDICATE_DONE = const(20)

_FLAG_READ = const(0x0002)
_FLAG_NOTIFY = const(0x0010)
_FLAG_INDICATE = const(0x0020)

# org.bluetooth.service.environmental_sensing
_ENV_SENSE_UUID = bluetooth.UUID(0x181A)
# org.bluetooth.characteristic.temperature
_TEMP_CHAR = (
    bluetooth.UUID(0x2A6E),
    _FLAG_READ | _FLAG_NOTIFY | _FLAG_INDICATE,
)
_ENV_SENSE_SERVICE = (
    _ENV_SENSE_UUID,
    (_TEMP_CHAR,),
)

# org.bluetooth.characteristic.gap.appearance.xml
_ADV_APPEARANCE_GENERIC_THERMOMETER = const(768)


class BLETemperature:
    def __init__(self, ble, name="PORTENTA_BLE"):
        self._ble = ble
        print("init1");
        self._ble.active(True) # not passing this part
        print("init2");
        self._ble.irq(self._irq)
        ((self._handle,),) = self._ble.gatts_register_services((_ENV_SENSE_SERVICE,))
        self._connections = set()
        self._payload = advertising_payload(
            name=name,
            services=[_ENV_SENSE_UUID],
            appearance=_ADV_APPEARANCE_GENERIC_THERMOMETER,
        )
        self._advertise()

    def _irq(self, event, data):
        # Track connections so we can send notifications.
        if event == _IRQ_CENTRAL_CONNECT:
            conn_handle, _, _ = data
            self._connections.add(conn_handle)
        elif event == _IRQ_CENTRAL_DISCONNECT:
            conn_handle, _, _ = data
            self._connections.remove(conn_handle)
            # Start advertising again to allow a new connection.
            self._advertise()
        elif event == _IRQ_GATTS_INDICATE_DONE:
            conn_handle, value_handle, status = data

    def set_temperature(self, temp_deg_c, notify=False, indicate=False):
        # Data is sint16 in degrees Celsius with a resolution of 0.01 degrees Celsius.
        # Write the local value, ready for a central to read.
        self._ble.gatts_write(self._handle, struct.pack("<h", int(temp_deg_c * 100)))
        if notify or indicate:
            for conn_handle in self._connections:
                if notify:
                    # Notify connected centrals.
                    self._ble.gatts_notify(conn_handle, self._handle)
                if indicate:
                    # Indicate connected centrals.
                    self._ble.gatts_indicate(conn_handle, self._handle)

    def _advertise(self, interval_us=500000):
        self._ble.gap_advertise(interval_us, adv_data=self._payload)


def demo():
    ble = bluetooth.BLE()
    temp = BLETemperature(ble)

    t = 25
    i = 0

    while True:
        # Write every second, notify every 10 seconds.
        i = (i + 1) % 10
        temp.set_temperature(t, notify=i == 0, indicate=False)
        # Random walk the temperature.
        t += random.uniform(-0.5, 0.5)
        time.sleep_ms(1000)


if __name__ == "__main__":
    demo()
2

Hi @donundeen ,

Can you please provide more information on the temperature sensor you would like to connect to Nicla Vision?

Best,

3

hi, sorry about the delay in response.

The temperature is just an arbitrary value, this is from the openMV example library for BLE.

The code isn't even getting to that point. It's getting hung up on the line:

self._ble.active(True) # not passing this part

Any thoughts?

Thanks!

4

Hi @donundeen ,

Please uninstall the version you have of OpenMV IDE and install the latest version available here Download | OpenMV. New resources (examples, firmware, documentation, etc.) are available.
I have just replicated the ble_temperature sketch example, the BLE module is activated properly.

Best,

5

this was super helpful, thanks!