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# Test characteristic read/write/notify from both GATTS and GATTC.
from micropython import const
import time, machine, bluetooth
TIMEOUT_MS = 5000
_IRQ_CENTRAL_CONNECT = const(1)
_IRQ_CENTRAL_DISCONNECT = const(2)
_IRQ_GATTS_WRITE = const(3)
_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)
_IRQ_GATTC_WRITE_DONE = const(17)
_IRQ_GATTC_NOTIFY = const(18)
SERVICE_UUID = bluetooth.UUID("A5A5A5A5-FFFF-9999-1111-5A5A5A5A5A5A")
CHAR_UUID = bluetooth.UUID("00000000-1111-2222-3333-444444444444")
CHAR = (
CHAR_UUID,
bluetooth.FLAG_READ | bluetooth.FLAG_WRITE | bluetooth.FLAG_NOTIFY,
)
SERVICE = (
SERVICE_UUID,
(CHAR,),
)
SERVICES = (SERVICE,)
waiting_event = None
waiting_data = None
value_handle = 0
def irq(event, data):
global waiting_event, waiting_data, value_handle
if event == _IRQ_CENTRAL_CONNECT:
print("_IRQ_CENTRAL_CONNECT")
elif event == _IRQ_CENTRAL_DISCONNECT:
print("_IRQ_CENTRAL_DISCONNECT")
elif event == _IRQ_GATTS_WRITE:
print("_IRQ_GATTS_WRITE", ble.gatts_read(data[-1]))
elif event == _IRQ_PERIPHERAL_CONNECT:
print("_IRQ_PERIPHERAL_CONNECT")
elif event == _IRQ_PERIPHERAL_DISCONNECT:
print("_IRQ_PERIPHERAL_DISCONNECT")
elif event == _IRQ_GATTC_CHARACTERISTIC_RESULT:
# conn_handle, def_handle, value_handle, properties, uuid = data
if data[-1] == CHAR_UUID:
print("_IRQ_GATTC_CHARACTERISTIC_RESULT", data[-1])
value_handle = data[2]
elif event == _IRQ_GATTC_READ_RESULT:
print("_IRQ_GATTC_READ_RESULT", data[-1])
elif event == _IRQ_GATTC_READ_DONE:
print("_IRQ_GATTC_READ_DONE", data[-1])
elif event == _IRQ_GATTC_WRITE_DONE:
print("_IRQ_GATTC_WRITE_DONE", data[-1])
elif event == _IRQ_GATTC_NOTIFY:
print("_IRQ_GATTC_NOTIFY", data[-1])
if waiting_event is not None:
if (isinstance(waiting_event, int) and event == waiting_event) or (
not isinstance(waiting_event, int) and waiting_event(event, data)
):
waiting_event = None
waiting_data = data
def wait_for_event(event, timeout_ms):
global waiting_event, waiting_data
waiting_event = event
waiting_data = None
t0 = time.ticks_ms()
while time.ticks_diff(time.ticks_ms(), t0) < timeout_ms:
if waiting_data:
return True
machine.idle()
return False
# 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:
# Write initial characteristic value.
ble.gatts_write(char_handle, "periph0")
# Wait for central to connect to us.
if not wait_for_event(_IRQ_CENTRAL_CONNECT, TIMEOUT_MS):
return
conn_handle, _, _ = waiting_data
# Wait for a write to the characteristic from the central.
wait_for_event(_IRQ_GATTS_WRITE, TIMEOUT_MS)
# Wait a bit, then write the characteristic and notify it.
time.sleep_ms(1000)
print("gatts_write")
ble.gatts_write(char_handle, "periph1")
print("gatts_notify")
ble.gatts_notify(conn_handle, char_handle)
# Wait for a write to the characteristic from the central.
wait_for_event(_IRQ_GATTS_WRITE, TIMEOUT_MS)
# Wait a bit, then notify a new value on the characteristic.
time.sleep_ms(1000)
print("gatts_notify")
ble.gatts_notify(conn_handle, char_handle, "periph2")
# Wait for the central to disconnect.
wait_for_event(_IRQ_CENTRAL_DISCONNECT, TIMEOUT_MS)
finally:
ble.active(0)
# Acting in central role.
def instance1():
multitest.next()
try:
# Connect to peripheral and then disconnect.
print("gap_connect")
ble.gap_connect(0, BDADDR)
if not wait_for_event(_IRQ_PERIPHERAL_CONNECT, TIMEOUT_MS):
return
conn_handle, _, _ = waiting_data
# Discover characteristics.
ble.gattc_discover_characteristics(conn_handle, 1, 65535)
wait_for_event(lambda event, data: value_handle, TIMEOUT_MS)
# Issue read of characteristic, should get initial value.
print("gattc_read")
ble.gattc_read(conn_handle, value_handle)
wait_for_event(_IRQ_GATTC_READ_RESULT, TIMEOUT_MS)
# Write to the characteristic, and ask for a response.
print("gattc_write")
ble.gattc_write(conn_handle, value_handle, "central0", 1)
wait_for_event(_IRQ_GATTC_WRITE_DONE, TIMEOUT_MS)
# Wait for a notify, then read new value.
wait_for_event(_IRQ_GATTC_NOTIFY, TIMEOUT_MS)
print("gattc_read")
ble.gattc_read(conn_handle, value_handle)
wait_for_event(_IRQ_GATTC_READ_RESULT, TIMEOUT_MS)
# Write to the characteristic, and ask for a response.
print("gattc_write")
ble.gattc_write(conn_handle, value_handle, "central1", 1)
wait_for_event(_IRQ_GATTC_WRITE_DONE, TIMEOUT_MS)
# Wait for a notify (should have new data), then read old value (should be unchanged).
wait_for_event(_IRQ_GATTC_NOTIFY, TIMEOUT_MS)
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)
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