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# Test L2CAP COC send/recv.
# Sends a sequence of varying-sized payloads from central->peripheral, and
# verifies that the other device sees the same data, then does the same thing
# peripheral->central.
from micropython import const
import time, machine, bluetooth, random
if not hasattr(bluetooth.BLE, "l2cap_connect"):
print("SKIP")
raise SystemExit
TIMEOUT_MS = 1000
_IRQ_CENTRAL_CONNECT = const(1)
_IRQ_CENTRAL_DISCONNECT = const(2)
_IRQ_PERIPHERAL_CONNECT = const(7)
_IRQ_PERIPHERAL_DISCONNECT = const(8)
_IRQ_L2CAP_ACCEPT = const(22)
_IRQ_L2CAP_CONNECT = const(23)
_IRQ_L2CAP_DISCONNECT = const(24)
_IRQ_L2CAP_RECV = const(25)
_IRQ_L2CAP_SEND_READY = const(26)
_L2CAP_MTU = const(450)
_L2CAP_PSM = const(22)
_PAYLOAD_LEN = const(_L2CAP_MTU - 50)
_PAYLOAD_LEN_STEP = -23
_NUM_PAYLOADS = const(16)
_RANDOM_SEED = 22
waiting_events = {}
def irq(event, data):
if event == _IRQ_CENTRAL_CONNECT:
conn_handle, addr_type, addr = data
print("_IRQ_CENTRAL_CONNECT")
waiting_events[event] = conn_handle
elif event == _IRQ_CENTRAL_DISCONNECT:
print("_IRQ_CENTRAL_DISCONNECT")
elif event == _IRQ_PERIPHERAL_CONNECT:
conn_handle, addr_type, addr = data
print("_IRQ_PERIPHERAL_CONNECT")
waiting_events[event] = conn_handle
elif event == _IRQ_PERIPHERAL_DISCONNECT:
print("_IRQ_PERIPHERAL_DISCONNECT")
elif event == _IRQ_L2CAP_ACCEPT:
conn_handle, cid, psm, our_mtu, peer_mtu = data
print("_IRQ_L2CAP_ACCEPT", psm, our_mtu, peer_mtu)
waiting_events[event] = (conn_handle, cid, psm)
elif event == _IRQ_L2CAP_CONNECT:
conn_handle, cid, psm, our_mtu, peer_mtu = data
print("_IRQ_L2CAP_CONNECT", psm, our_mtu, peer_mtu)
waiting_events[event] = (conn_handle, cid, psm, our_mtu, peer_mtu)
elif event == _IRQ_L2CAP_DISCONNECT:
conn_handle, cid, psm, status = data
print("_IRQ_L2CAP_DISCONNECT", psm, status)
elif event == _IRQ_L2CAP_RECV:
conn_handle, cid = data
elif event == _IRQ_L2CAP_SEND_READY:
conn_handle, cid, status = 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))
def send_data(ble, conn_handle, cid):
buf = bytearray(_PAYLOAD_LEN)
mv = memoryview(buf)
print("l2cap_send", _NUM_PAYLOADS, _PAYLOAD_LEN)
for i in range(_NUM_PAYLOADS):
n = _PAYLOAD_LEN + i * _PAYLOAD_LEN_STEP
for j in range(n):
buf[j] = random.randint(0, 255)
if not ble.l2cap_send(conn_handle, cid, mv[:n]):
wait_for_event(_IRQ_L2CAP_SEND_READY, TIMEOUT_MS)
def recv_data(ble, conn_handle, cid):
buf = bytearray(_PAYLOAD_LEN)
recv_bytes = 0
recv_correct = 0
expected_bytes = (
_PAYLOAD_LEN * _NUM_PAYLOADS + _PAYLOAD_LEN_STEP * _NUM_PAYLOADS * (_NUM_PAYLOADS - 1) // 2
)
print("l2cap_recvinto", expected_bytes)
while recv_bytes < expected_bytes:
wait_for_event(_IRQ_L2CAP_RECV, TIMEOUT_MS)
while True:
n = ble.l2cap_recvinto(conn_handle, cid, buf)
if n == 0:
break
recv_bytes += n
for i in range(n):
if buf[i] == random.randint(0, 255):
recv_correct += 1
return recv_bytes, recv_correct
# Acting in peripheral role.
def instance0():
multitest.globals(BDADDR=ble.config("mac"))
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)
print("l2cap_listen")
ble.l2cap_listen(_L2CAP_PSM, _L2CAP_MTU)
conn_handle, cid, psm = wait_for_event(_IRQ_L2CAP_ACCEPT, TIMEOUT_MS)
conn_handle, cid, psm, our_mtu, peer_mtu = wait_for_event(_IRQ_L2CAP_CONNECT, TIMEOUT_MS)
random.seed(_RANDOM_SEED)
recv_bytes, recv_correct = recv_data(ble, conn_handle, cid)
send_data(ble, conn_handle, cid)
wait_for_event(_IRQ_L2CAP_DISCONNECT, TIMEOUT_MS)
print("received", recv_bytes, recv_correct)
# 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(*BDADDR)
conn_handle = wait_for_event(_IRQ_PERIPHERAL_CONNECT, TIMEOUT_MS)
print("l2cap_connect")
ble.l2cap_connect(conn_handle, _L2CAP_PSM, _L2CAP_MTU)
conn_handle, cid, psm, our_mtu, peer_mtu = wait_for_event(_IRQ_L2CAP_CONNECT, TIMEOUT_MS)
random.seed(_RANDOM_SEED)
send_data(ble, conn_handle, cid)
recv_bytes, recv_correct = recv_data(ble, conn_handle, cid)
# Disconnect channel.
print("l2cap_disconnect")
ble.l2cap_disconnect(conn_handle, cid)
wait_for_event(_IRQ_L2CAP_DISCONNECT, TIMEOUT_MS)
print("received", recv_bytes, recv_correct)
# 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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