Cannot find module 'bluetooth' on Pico W firmware 1.20

[Huc91]

Hi, I was trying the example on bluetooth from the connecting to the internet with pico w book.
I have this error when I try to import the bluetooth module:
ImportError: no module named 'bluetooth'
The firmware is the latest one and the model of the pico is a W so it should have a bluetooth.
What am I doing wrong? I tried to reinstall the firmware from Thonny but is not working.

For reference this is the code from the book that i'm trying to run:
6.1. Advertsing a Bluetooth service

# Helpers for generating BLE advertising payloads
from micropython import const
import struct
import bluetooth

print(bluetooth)

# Advertising payloads are repeated packets of the following form:
# 1 byte data length (N + 1)
# 1 byte type (see constants below)
# N bytes type-specific data
_ADV_TYPE_FLAGS = const(0x01)
_ADV_TYPE_NAME = const(0x09)
_ADV_TYPE_UUID16_COMPLETE = const(0x3)
_ADV_TYPE_UUID32_COMPLETE = const(0x5)
_ADV_TYPE_UUID128_COMPLETE = const(0x7)
_ADV_TYPE_UUID16_MORE = const(0x2)
_ADV_TYPE_UUID32_MORE = const(0x4)
_ADV_TYPE_UUID128_MORE = const(0x6)
_ADV_TYPE_APPEARANCE = const(0x19)

# Generate a payload to be passed to gap_advertise(adv_data=...).
def advertising_payload(limited_disc=False, br_edr=False, name=None, services=None, appearance=0):
    payload = bytearray()

    def _append(adv_type, value):
        nonlocal payload
        payload += struct.pack("BB", len(value) + 1, adv_type) + value

    _append(_ADV_TYPE_FLAGS, struct.pack("B", (0x01 if limited_disc else 0x02) + (0x18 if br_edr else 0x04)))

    if name:
        _append(_ADV_TYPE_NAME, name)

    if services:
        for uuid in services:
            b = bytes(uuid)
            if len(b) == 2:
                _append(_ADV_TYPE_UUID16_COMPLETE, b)
            elif len(b) == 4:
                _append(_ADV_TYPE_UUID32_COMPLETE, b)
            elif len(b) == 16:
                _append(_ADV_TYPE_UUID128_COMPLETE, b)

    # See org.bluetooth.characteristic.gap.appearance.xml
    if appearance:
        _append(_ADV_TYPE_APPEARANCE, struct.pack("<h", appearance))

    return payload


def decode_field(payload, adv_type):
    i = 0
    result = []
    while i + 1 < len(payload):
        if payload[i + 1] == adv_type:
            result.append(payload[i + 2 : i + payload[i] + 1])
        i += 1 + payload[i]
    return result


def decode_name(payload):
    n = decode_field(payload, _ADV_TYPE_NAME)
    return str(n[0], "utf-8") if n else ""


def decode_services(payload):
    services = []
    for u in decode_field(payload, _ADV_TYPE_UUID16_COMPLETE):
        services.append(bluetooth.UUID(struct.unpack("<h", u)[0]))
    for u in decode_field(payload, _ADV_TYPE_UUID32_COMPLETE):
        services.append(bluetooth.UUID(struct.unpack("<d", u)[0]))
    for u in decode_field(payload, _ADV_TYPE_UUID128_COMPLETE):
        services.append(bluetooth.UUID(u))
    return services


def demo():
    payload = advertising_payload(
        name="micropython",
        services=[
            bluetooth.UUID(0x181A),
            bluetooth.UUID("6E400001-B5A3-F393-E0A9-E50E24DCCA9E"),
        ],
    )
    print(payload)
    print(decode_name(payload))
    print(decode_services(payload))


if __name__ == "__main__":
    demo()

[robert-hh]

The firmware is the latest one

Do you mean v1.20.0 or the most recent nightly build 1.20.0.311 ? Bluetooth was added to the Pico after v1.20.0. So you have to install the nightly build.

[Huc91]

Yes It's working

[Linards888]

where can you find the 1.20.0.311?

[robert-hh]

1.20.0.311 is a nightly build between v1.20 and v1.21. It is not available at the server. You could only build it yourself from the sources, if you invest the effort of finding the right commit. But for Bluetooth is is not required. V1.21 and v1.22 and the actual preview builds provide it too.

[robert-hh]

See https://micropython.org/download/RPI_PICO_W/

[Linards888]

Ok Thanks!