134 lines
4.1 KiB
Python
134 lines
4.1 KiB
Python
# Ping-pong GATT notifications between two devices.
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from micropython import const
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import time, machine, bluetooth
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TIMEOUT_MS = 2000
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_IRQ_CENTRAL_CONNECT = const(1)
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_IRQ_CENTRAL_DISCONNECT = const(2)
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_IRQ_PERIPHERAL_CONNECT = const(7)
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_IRQ_PERIPHERAL_DISCONNECT = const(8)
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_IRQ_GATTC_CHARACTERISTIC_RESULT = const(11)
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_IRQ_GATTC_CHARACTERISTIC_DONE = const(12)
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_IRQ_GATTC_NOTIFY = const(18)
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# How long to run the test for.
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_NUM_NOTIFICATIONS = const(50)
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SERVICE_UUID = bluetooth.UUID("A5A5A5A5-FFFF-9999-1111-5A5A5A5A5A5A")
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CHAR_UUID = bluetooth.UUID("00000000-1111-2222-3333-444444444444")
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CHAR = (
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CHAR_UUID,
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bluetooth.FLAG_NOTIFY,
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)
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SERVICE = (
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SERVICE_UUID,
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(CHAR,),
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)
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SERVICES = (SERVICE,)
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is_central = False
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waiting_events = {}
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def irq(event, data):
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if event == _IRQ_CENTRAL_CONNECT:
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waiting_events[event] = data[0]
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elif event == _IRQ_PERIPHERAL_CONNECT:
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waiting_events[event] = data[0]
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elif event == _IRQ_GATTC_CHARACTERISTIC_RESULT:
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# conn_handle, def_handle, value_handle, properties, uuid = data
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if data[-1] == CHAR_UUID:
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waiting_events[event] = data[2]
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else:
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return
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elif event == _IRQ_GATTC_NOTIFY:
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if is_central:
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conn_handle, value_handle, notify_data = data
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ble.gatts_notify(conn_handle, value_handle, b"central" + notify_data)
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if event not in waiting_events:
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waiting_events[event] = None
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def wait_for_event(event, timeout_ms):
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t0 = time.ticks_ms()
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while time.ticks_diff(time.ticks_ms(), t0) < timeout_ms:
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if event in waiting_events:
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return waiting_events.pop(event)
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machine.idle()
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raise ValueError("Timeout waiting for {}".format(event))
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# Acting in peripheral role.
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def instance0():
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multitest.globals(BDADDR=ble.config("mac"))
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((char_handle,),) = ble.gatts_register_services(SERVICES)
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print("gap_advertise")
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ble.gap_advertise(20_000, b"\x02\x01\x06\x04\xffMPY")
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multitest.next()
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try:
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# Wait for central to connect to us.
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conn_handle = wait_for_event(_IRQ_CENTRAL_CONNECT, TIMEOUT_MS)
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# Discover characteristics.
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ble.gattc_discover_characteristics(conn_handle, 1, 65535)
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value_handle = wait_for_event(_IRQ_GATTC_CHARACTERISTIC_RESULT, TIMEOUT_MS)
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wait_for_event(_IRQ_GATTC_CHARACTERISTIC_DONE, TIMEOUT_MS)
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# Give the central enough time to discover chars.
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time.sleep_ms(500)
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ticks_start = time.ticks_ms()
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for i in range(_NUM_NOTIFICATIONS):
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# Send a notification and wait for a response.
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ble.gatts_notify(conn_handle, value_handle, "peripheral" + str(i))
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wait_for_event(_IRQ_GATTC_NOTIFY, TIMEOUT_MS)
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ticks_end = time.ticks_ms()
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ticks_total = time.ticks_diff(ticks_end, ticks_start)
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multitest.output_metric(
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"Acknowledged {} notifications in {} ms. {} ms/notification.".format(
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_NUM_NOTIFICATIONS, ticks_total, ticks_total // _NUM_NOTIFICATIONS
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)
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)
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# Disconnect the central.
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print("gap_disconnect:", ble.gap_disconnect(conn_handle))
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wait_for_event(_IRQ_CENTRAL_DISCONNECT, TIMEOUT_MS)
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finally:
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ble.active(0)
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# Acting in central role.
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def instance1():
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global is_central
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is_central = True
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((char_handle,),) = ble.gatts_register_services(SERVICES)
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multitest.next()
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try:
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# Connect to peripheral and then disconnect.
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print("gap_connect")
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ble.gap_connect(*BDADDR)
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conn_handle = wait_for_event(_IRQ_PERIPHERAL_CONNECT, TIMEOUT_MS)
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# Discover characteristics.
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ble.gattc_discover_characteristics(conn_handle, 1, 65535)
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value_handle = wait_for_event(_IRQ_GATTC_CHARACTERISTIC_RESULT, TIMEOUT_MS)
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wait_for_event(_IRQ_GATTC_CHARACTERISTIC_DONE, TIMEOUT_MS)
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# The IRQ handler will respond to each notification.
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# Wait for the peripheral to disconnect us.
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wait_for_event(_IRQ_PERIPHERAL_DISCONNECT, 20000)
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finally:
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ble.active(0)
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ble = bluetooth.BLE()
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ble.active(1)
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ble.irq(irq)
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