circuitpython/tests/multi_bluetooth/ble_gap_device_name.py

# Test BLE GAP device name get/set

from micropython import const
import time, machine, bluetooth

TIMEOUT_MS = 5000

_IRQ_CENTRAL_CONNECT = const(1)
_IRQ_CENTRAL_DISCONNECT = const(2)
_IRQ_PERIPHERAL_CONNECT = const(7)
_IRQ_PERIPHERAL_DISCONNECT = const(8)
_IRQ_GATTC_CHARACTERISTIC_RESULT = const(11)
_IRQ_GATTC_CHARACTERISTIC_DONE = const(12)
_IRQ_GATTC_READ_RESULT = const(15)
_IRQ_GATTC_READ_DONE = const(16)

GAP_DEVICE_NAME_UUID = bluetooth.UUID(0x2A00)

waiting_events = {}


def irq(event, data):
    if event == _IRQ_CENTRAL_CONNECT:
        print("_IRQ_CENTRAL_CONNECT")
        waiting_events[event] = data[0]
    elif event == _IRQ_CENTRAL_DISCONNECT:
        print("_IRQ_CENTRAL_DISCONNECT")
    elif event == _IRQ_PERIPHERAL_CONNECT:
        print("_IRQ_PERIPHERAL_CONNECT")
        waiting_events[event] = data[0]
    elif event == _IRQ_PERIPHERAL_DISCONNECT:
        print("_IRQ_PERIPHERAL_DISCONNECT")
    elif event == _IRQ_GATTC_CHARACTERISTIC_RESULT:
        if data[-1] == GAP_DEVICE_NAME_UUID:
            print("_IRQ_GATTC_CHARACTERISTIC_RESULT", data[-1])
            waiting_events[event] = data[2]
        else:
            return
    elif event == _IRQ_GATTC_CHARACTERISTIC_DONE:
        print("_IRQ_GATTC_CHARACTERISTIC_DONE")
    elif event == _IRQ_GATTC_READ_RESULT:
        print("_IRQ_GATTC_READ_RESULT", bytes(data[-1]))

    if event not in waiting_events:
        waiting_events[event] = None


def wait_for_event(event, timeout_ms):
    t0 = time.ticks_ms()
    while time.ticks_diff(time.ticks_ms(), t0) < timeout_ms:
        if event in waiting_events:
            return waiting_events.pop(event)
        machine.idle()
    raise ValueError("Timeout waiting for {}".format(event))


# Acting in peripheral role.
def instance0():
    multitest.globals(BDADDR=ble.config("mac"))

    # Test setting and getting the GAP device name before registering services.
    ble.config(gap_name="GAP_NAME")
    print(ble.config("gap_name"))

    # Create an empty service and start advertising.
    ble.gatts_register_services([])
    print("gap_advertise")
    multitest.next()

    try:
        # Do multiple iterations to test changing the name.
        for iteration in range(2):
            # Set the GAP device name and start advertising.
            ble.config(gap_name="GAP_NAME{}".format(iteration))
            print(ble.config("gap_name"))
            ble.gap_advertise(20_000)

            # Wait for central to connect, then wait for it to disconnect.
            wait_for_event(_IRQ_CENTRAL_CONNECT, TIMEOUT_MS)
            wait_for_event(_IRQ_CENTRAL_DISCONNECT, 4 * TIMEOUT_MS)
    finally:
        ble.active(0)


# Acting in central role.
def instance1():
    multitest.next()
    try:
        value_handle = None
        for iteration in range(2):
            # Wait for peripheral to start advertising.
            time.sleep_ms(500)

            # Connect to peripheral.
            print("gap_connect")
            ble.gap_connect(*BDADDR)
            conn_handle = wait_for_event(_IRQ_PERIPHERAL_CONNECT, TIMEOUT_MS)

            if iteration == 0:
                # Only do characteristic discovery on the first iteration,
                # assume value_handle is unchanged on the second.
                print("gattc_discover_characteristics")
                ble.gattc_discover_characteristics(conn_handle, 1, 65535)
                value_handle = wait_for_event(_IRQ_GATTC_CHARACTERISTIC_RESULT, TIMEOUT_MS)
                wait_for_event(_IRQ_GATTC_CHARACTERISTIC_DONE, TIMEOUT_MS)

            # Read the peripheral's GAP device name.
            print("gattc_read")
            ble.gattc_read(conn_handle, value_handle)
            wait_for_event(_IRQ_GATTC_READ_RESULT, TIMEOUT_MS)

            # Disconnect from peripheral.
            print("gap_disconnect:", ble.gap_disconnect(conn_handle))
            wait_for_event(_IRQ_PERIPHERAL_DISCONNECT, TIMEOUT_MS)
    finally:
        ble.active(0)


ble = bluetooth.BLE()
ble.active(1)
ble.irq(irq)