134 lines
4.0 KiB
Python
134 lines
4.0 KiB
Python
# Ping-pong GATT notifications between two devices.
|
|
|
|
from micropython import const
|
|
import time, machine, bluetooth
|
|
|
|
TIMEOUT_MS = 2000
|
|
|
|
_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_NOTIFY = const(18)
|
|
|
|
# How long to run the test for.
|
|
_NUM_NOTIFICATIONS = const(50)
|
|
|
|
SERVICE_UUID = bluetooth.UUID("A5A5A5A5-FFFF-9999-1111-5A5A5A5A5A5A")
|
|
CHAR_UUID = bluetooth.UUID("00000000-1111-2222-3333-444444444444")
|
|
CHAR = (
|
|
CHAR_UUID,
|
|
bluetooth.FLAG_NOTIFY,
|
|
)
|
|
SERVICE = (
|
|
SERVICE_UUID,
|
|
(CHAR,),
|
|
)
|
|
SERVICES = (SERVICE,)
|
|
|
|
is_central = False
|
|
|
|
waiting_events = {}
|
|
|
|
|
|
def irq(event, data):
|
|
if event == _IRQ_CENTRAL_CONNECT:
|
|
waiting_events[event] = data[0]
|
|
elif event == _IRQ_PERIPHERAL_CONNECT:
|
|
waiting_events[event] = data[0]
|
|
elif event == _IRQ_GATTC_CHARACTERISTIC_RESULT:
|
|
# conn_handle, def_handle, value_handle, properties, uuid = data
|
|
if data[-1] == CHAR_UUID:
|
|
waiting_events[event] = data[2]
|
|
else:
|
|
return
|
|
elif event == _IRQ_GATTC_NOTIFY:
|
|
if is_central:
|
|
conn_handle, value_handle, notify_data = data
|
|
ble.gatts_notify(conn_handle, value_handle, b"central" + notify_data)
|
|
|
|
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"))
|
|
((char_handle,),) = ble.gatts_register_services(SERVICES)
|
|
print("gap_advertise")
|
|
ble.gap_advertise(20_000, b"\x02\x01\x06\x04\xffMPY")
|
|
multitest.next()
|
|
try:
|
|
# Wait for central to connect to us.
|
|
conn_handle = wait_for_event(_IRQ_CENTRAL_CONNECT, TIMEOUT_MS)
|
|
|
|
# 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)
|
|
|
|
# Give the central enough time to discover chars.
|
|
time.sleep_ms(500)
|
|
|
|
ticks_start = time.ticks_ms()
|
|
|
|
for i in range(_NUM_NOTIFICATIONS):
|
|
# Send a notification and wait for a response.
|
|
ble.gatts_notify(conn_handle, value_handle, "peripheral" + str(i))
|
|
wait_for_event(_IRQ_GATTC_NOTIFY, TIMEOUT_MS)
|
|
|
|
ticks_end = time.ticks_ms()
|
|
ticks_total = time.ticks_diff(ticks_end, ticks_start)
|
|
print(
|
|
"Acknowledged {} notifications in {} ms. {} ms/notification.".format(
|
|
_NUM_NOTIFICATIONS, ticks_total, ticks_total // _NUM_NOTIFICATIONS
|
|
)
|
|
)
|
|
|
|
# Disconnect the central.
|
|
print("gap_disconnect:", ble.gap_disconnect(conn_handle))
|
|
wait_for_event(_IRQ_CENTRAL_DISCONNECT, TIMEOUT_MS)
|
|
finally:
|
|
ble.active(0)
|
|
|
|
|
|
# Acting in central role.
|
|
def instance1():
|
|
global is_central
|
|
is_central = True
|
|
((char_handle,),) = ble.gatts_register_services(SERVICES)
|
|
multitest.next()
|
|
try:
|
|
# Connect to peripheral and then disconnect.
|
|
print("gap_connect")
|
|
ble.gap_connect(*BDADDR)
|
|
conn_handle = wait_for_event(_IRQ_PERIPHERAL_CONNECT, TIMEOUT_MS)
|
|
|
|
# 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)
|
|
|
|
# The IRQ handler will respond to each notification.
|
|
|
|
# Wait for the peripheral to disconnect us.
|
|
wait_for_event(_IRQ_PERIPHERAL_DISCONNECT, 20000)
|
|
finally:
|
|
ble.active(0)
|
|
|
|
|
|
ble = bluetooth.BLE()
|
|
ble.active(1)
|
|
ble.irq(irq)
|