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# Write characteristic from central to peripheral and time data rate.
from micropython import const
import time, machine, bluetooth
TIMEOUT_MS = 2000
_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_WRITE_DONE = const(17)
_IRQ_MTU_EXCHANGED = const(21)
# How long to run the test for.
_NUM_NOTIFICATIONS = const(40)
_MTU_SIZE = const(131)
_CHAR_SIZE = const(_MTU_SIZE - 3)
SERVICE_UUID = bluetooth.UUID("A5A5A5A5-FFFF-9999-1111-5A5A5A5A5A5A")
CHAR_UUID = bluetooth.UUID("00000000-1111-2222-3333-444444444444")
CHAR = (CHAR_UUID, bluetooth.FLAG_WRITE | bluetooth.FLAG_WRITE_NO_RESPONSE)
SERVICE = (SERVICE_UUID, (CHAR,))
SERVICES = (SERVICE,)
packet_sequence = 0
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_GATTS_WRITE:
global packet_sequence
conn_handle, attr_handle = data
data = ble.gatts_read(attr_handle)
if not (data[0] == packet_sequence and data[-1] == (256 - packet_sequence) & 0xFF):
print("_IRQ_GATTS_WRITE data invalid:", packet_sequence, data)
elif packet_sequence % 10 == 0:
print("_IRQ_GATTS_WRITE", packet_sequence)
packet_sequence += 1
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_MTU_EXCHANGED:
# ATT MTU exchange complete (either initiated by us or the remote device).
conn_handle, mtu = data
print("_IRQ_MTU_EXCHANGED:", mtu)
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)
ble.gatts_set_buffer(char_handle, _CHAR_SIZE)
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)
# Wait for central to disconnect us.
wait_for_event(_IRQ_CENTRAL_DISCONNECT, 30000)
print("final packet_sequence:", packet_sequence)
finally:
ble.active(0)
# Acting in central role.
def instance1():
global packet_sequence
((char_handle,),) = ble.gatts_register_services(SERVICES)
multitest.next()
try:
# Connect to peripheral and then disconnect.
print("gap_connect")
ble.config(mtu=_MTU_SIZE)
ble.gap_connect(*BDADDR)
conn_handle = wait_for_event(_IRQ_PERIPHERAL_CONNECT, TIMEOUT_MS)
ble.gattc_exchange_mtu(conn_handle)
# 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)
# Send data!
data = bytearray(ord("A") + (i % 64) for i in range(_CHAR_SIZE))
for mode in (0, 1):
ticks_start = time.ticks_ms()
for i in range(_NUM_NOTIFICATIONS):
data[0] = packet_sequence
data[-1] = 256 - packet_sequence
if packet_sequence % 10 == 0:
print("gattc_write", packet_sequence)
if mode == 0:
while True:
try:
ble.gattc_write(conn_handle, value_handle, data, mode)
break
except OSError:
pass
else:
ble.gattc_write(conn_handle, value_handle, data, mode)
wait_for_event(_IRQ_GATTC_WRITE_DONE, TIMEOUT_MS)
packet_sequence += 1
ticks_end = time.ticks_ms()
ticks_total = time.ticks_diff(ticks_end, ticks_start)
multitest.output_metric(
"Did {} writes in {} ms. {} ms/write, {} bytes/sec".format(
_NUM_NOTIFICATIONS,
ticks_total,
ticks_total / _NUM_NOTIFICATIONS,
_NUM_NOTIFICATIONS * len(data) * 1000 // ticks_total,
)
)
time.sleep_ms(100)
# DIsconnect the peripheral.
print("gap_disconnect:", ble.gap_disconnect(conn_handle))
wait_for_event(_IRQ_PERIPHERAL_DISCONNECT, 20000)
finally:
ble.active(0)
ble = bluetooth.BLE()
ble.active(1)
ble.irq(irq)
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