tests/multi_bluetooth: Add performance test for gatt char writes.

Signed-off-by: Damien George <damien@micropython.org>

tests/multi_bluetooth/perf_gatt_char_write.py

@@ -0,0 +1,151 @@
+# 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)
+
+            print(
+                "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)

tests/multi_bluetooth/perf_gatt_char_write.py.exp

@@ -0,0 +1,24 @@
+--- instance0 ---
+gap_advertise
+_IRQ_MTU_EXCHANGED: 131
+_IRQ_GATTS_WRITE 0
+_IRQ_GATTS_WRITE 10
+_IRQ_GATTS_WRITE 20
+_IRQ_GATTS_WRITE 30
+_IRQ_GATTS_WRITE 40
+_IRQ_GATTS_WRITE 50
+_IRQ_GATTS_WRITE 60
+_IRQ_GATTS_WRITE 70
+final packet_sequence: 80
+--- instance1 ---
+gap_connect
+_IRQ_MTU_EXCHANGED: 131
+gattc_write 0
+gattc_write 10
+gattc_write 20
+gattc_write 30
+gattc_write 40
+gattc_write 50
+gattc_write 60
+gattc_write 70
+gap_disconnect: True