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tests/multi_bluetooth/ble_mtu: Split peripheral/central-initiated.
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btstack only supports central-initiated, so this allows us to have a test
that works on both (ble_mtu.py), and then another one for just the NimBLE
supported behavior (ble_mtu_peripheral.py).

Signed-off-by: Jim Mussared <[email protected]>
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@jimmo
jimmo committed Apr 26, 2023
1 parent dcb863e commit a652695
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89 changes: 33 additions & 56 deletions tests/multi_bluetooth/ble_mtu.py
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Original file line number Diff line number Diff line change
@@ -1,23 +1,18 @@
# Test MTU exchange (initiated by both central and peripheral) and the effect on
# notify and write size.

# Seven connections are made (four central->peripheral, three peripheral->central).
# Test MTU exchange (initiated by central) and the effect on notify and write
# size.
#
# See ble_mtu_peripheral.py which tests peripheral-initiated MTU exchange (not supported on btstack).
#
# Four connections are made:
#
# Test | Requested | Preferred | Result | Notes
# 0 | 300 (C) | 256 (P) | 256 |
# 1 | 300 (C) | 200 (P) | 200 |
# 2 | 300 (C) | 400 (P) | 300 |
# 3 | 300 (C) | 50 (P) | 50 | Shorter than 64 so the notification is truncated.
# 4 | 290 (P) | 256 (C) | 256 |
# 5 | 290 (P) | 190 (C) | 190 |
# 6 | 290 (P) | 350 (C) | 290 |
#
# For each connection a notification is sent by the server (peripheral) and a characteristic
# is written by the client (central) to ensure that the expected size is transmitted.
#
# Note: This currently fails on btstack for two reasons:
# - btstack doesn't truncate writes to the MTU (it fails instead)
# - btstack (in central mode) doesn't handle the peripheral initiating the MTU exchange

from micropython import const
import time, machine, bluetooth
Expand Down Expand Up @@ -97,48 +92,35 @@ def instance0():
multitest.globals(BDADDR=ble.config("mac"))
((char_handle,),) = ble.gatts_register_services(SERVICES)
ble.gatts_set_buffer(char_handle, 500, False)
print("gap_advertise")
ble.gap_advertise(20_000, b"\x02\x01\x06\x04\xffMPY")
multitest.next()

default_mtus = [256, 200, 400, 50]
try:
for i in range(7):
if i == 1:
ble.config(mtu=200)
elif i == 2:
ble.config(mtu=400)
elif i == 3:
ble.config(mtu=50)
elif i >= 4:
ble.config(mtu=290)
else:
# This is the NimBLE default.
ble.config(mtu=256)
for i in range(4):
ble.config(mtu=default_mtus[i])

print("gap_advertise")
ble.gap_advertise(20_000, b"\x02\x01\x06\x04\xffMPY")
multitest.broadcast(f"peripheral:adv:{i}")

# Wait for central to connect to us.
conn_handle = wait_for_event(_IRQ_CENTRAL_CONNECT, TIMEOUT_MS)

if i >= 4:
print("gattc_exchange_mtu")
ble.gattc_exchange_mtu(conn_handle)

mtu = wait_for_event(_IRQ_MTU_EXCHANGED, TIMEOUT_MS)

multitest.wait(f"client:discovery:{i}")

print("gatts_notify")
ble.gatts_notify(conn_handle, char_handle, str(i) * 64)

# Extra timeout while client does service discovery.
wait_for_event(_IRQ_GATTS_WRITE, TIMEOUT_MS * 2)
wait_for_event(_IRQ_GATTS_WRITE, TIMEOUT_MS)

print("gatts_read")
data = ble.gatts_read(char_handle)
print("characteristic len:", len(data), chr(data[0]))

# Wait for the central to disconnect.
wait_for_event(_IRQ_CENTRAL_DISCONNECT, TIMEOUT_MS)

print("gap_advertise")
ble.gap_advertise(20_000, b"\x02\x01\x06\x04\xffMPY")

finally:
ble.active(0)

Expand All @@ -147,41 +129,36 @@ def instance0():
def instance1():
multitest.next()
try:
for i in range(7):
if i < 4:
ble.config(mtu=300)
elif i == 5:
ble.config(mtu=190)
elif i == 6:
ble.config(mtu=350)
else:
ble.config(mtu=256)

# Connect to peripheral and then disconnect.
# Extra scan timeout allows for the peripheral to receive the previous disconnect
# event and start advertising again.
for i in range(4):
ble.config(mtu=300)

multitest.wait(f"peripheral:adv:{i}")

print("gap_connect")
ble.gap_connect(BDADDR[0], BDADDR[1], 5000)
ble.gap_connect(BDADDR[0], BDADDR[1], TIMEOUT_MS)
conn_handle = wait_for_event(_IRQ_PERIPHERAL_CONNECT, TIMEOUT_MS)

if i < 4:
print("gattc_exchange_mtu")
ble.gattc_exchange_mtu(conn_handle)
# Central-initiated mtu exchange.
print("gattc_exchange_mtu")
ble.gattc_exchange_mtu(conn_handle)

mtu = wait_for_event(_IRQ_MTU_EXCHANGED, TIMEOUT_MS)

wait_for_event(_IRQ_GATTC_NOTIFY, TIMEOUT_MS)

print("gattc_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)

# Write 20 more than the MTU to test truncation.
multitest.broadcast(f"client:discovery:{i}")

wait_for_event(_IRQ_GATTC_NOTIFY, TIMEOUT_MS)

print("gattc_write")
ble.gattc_write(conn_handle, value_handle, chr(ord("a") + i) * (mtu + 20), 1)
ble.gattc_write(conn_handle, value_handle, chr(ord("a") + i) * (mtu - 3), 1)
wait_for_event(_IRQ_GATTC_WRITE_DONE, TIMEOUT_MS)

time.sleep_ms(300)

# Disconnect from peripheral.
print("gap_disconnect:", ble.gap_disconnect(conn_handle))
wait_for_event(_IRQ_PERIPHERAL_DISCONNECT, TIMEOUT_MS)
Expand Down
69 changes: 4 additions & 65 deletions tests/multi_bluetooth/ble_mtu.py.exp
View file
Original file line number Diff line number Diff line change
Expand Up @@ -31,43 +31,15 @@ _IRQ_GATTS_WRITE
gatts_read
characteristic len: 47 d
_IRQ_CENTRAL_DISCONNECT
gap_advertise
_IRQ_CENTRAL_CONNECT
gattc_exchange_mtu
_IRQ_MTU_EXCHANGED 256
gatts_notify
_IRQ_GATTS_WRITE
gatts_read
characteristic len: 253 e
_IRQ_CENTRAL_DISCONNECT
gap_advertise
_IRQ_CENTRAL_CONNECT
gattc_exchange_mtu
_IRQ_MTU_EXCHANGED 190
gatts_notify
_IRQ_GATTS_WRITE
gatts_read
characteristic len: 187 f
_IRQ_CENTRAL_DISCONNECT
gap_advertise
_IRQ_CENTRAL_CONNECT
gattc_exchange_mtu
_IRQ_MTU_EXCHANGED 290
gatts_notify
_IRQ_GATTS_WRITE
gatts_read
characteristic len: 287 g
_IRQ_CENTRAL_DISCONNECT
gap_advertise
--- instance1 ---
gap_connect
_IRQ_PERIPHERAL_CONNECT
gattc_exchange_mtu
_IRQ_MTU_EXCHANGED 256
_IRQ_GATTC_NOTIFY 64 0
gattc_discover_characteristics
_IRQ_GATTC_CHARACTERISTIC_RESULT UUID('00000000-1111-2222-3333-444444444444')
_IRQ_GATTC_CHARACTERISTIC_DONE
_IRQ_GATTC_NOTIFY 64 0
gattc_write
_IRQ_GATTC_WRITE_DONE
gap_disconnect: True
Expand All @@ -76,10 +48,10 @@ gap_connect
_IRQ_PERIPHERAL_CONNECT
gattc_exchange_mtu
_IRQ_MTU_EXCHANGED 200
_IRQ_GATTC_NOTIFY 64 1
gattc_discover_characteristics
_IRQ_GATTC_CHARACTERISTIC_RESULT UUID('00000000-1111-2222-3333-444444444444')
_IRQ_GATTC_CHARACTERISTIC_DONE
_IRQ_GATTC_NOTIFY 64 1
gattc_write
_IRQ_GATTC_WRITE_DONE
gap_disconnect: True
Expand All @@ -88,10 +60,10 @@ gap_connect
_IRQ_PERIPHERAL_CONNECT
gattc_exchange_mtu
_IRQ_MTU_EXCHANGED 300
_IRQ_GATTC_NOTIFY 64 2
gattc_discover_characteristics
_IRQ_GATTC_CHARACTERISTIC_RESULT UUID('00000000-1111-2222-3333-444444444444')
_IRQ_GATTC_CHARACTERISTIC_DONE
_IRQ_GATTC_NOTIFY 64 2
gattc_write
_IRQ_GATTC_WRITE_DONE
gap_disconnect: True
Expand All @@ -100,43 +72,10 @@ gap_connect
_IRQ_PERIPHERAL_CONNECT
gattc_exchange_mtu
_IRQ_MTU_EXCHANGED 50
_IRQ_GATTC_NOTIFY 47 3
gattc_discover_characteristics
_IRQ_GATTC_CHARACTERISTIC_RESULT UUID('00000000-1111-2222-3333-444444444444')
_IRQ_GATTC_CHARACTERISTIC_DONE
gattc_write
_IRQ_GATTC_WRITE_DONE
gap_disconnect: True
_IRQ_PERIPHERAL_DISCONNECT
gap_connect
_IRQ_PERIPHERAL_CONNECT
_IRQ_MTU_EXCHANGED 256
_IRQ_GATTC_NOTIFY 64 4
gattc_discover_characteristics
_IRQ_GATTC_CHARACTERISTIC_RESULT UUID('00000000-1111-2222-3333-444444444444')
_IRQ_GATTC_CHARACTERISTIC_DONE
gattc_write
_IRQ_GATTC_WRITE_DONE
gap_disconnect: True
_IRQ_PERIPHERAL_DISCONNECT
gap_connect
_IRQ_PERIPHERAL_CONNECT
_IRQ_MTU_EXCHANGED 190
_IRQ_GATTC_NOTIFY 64 5
gattc_discover_characteristics
_IRQ_GATTC_CHARACTERISTIC_RESULT UUID('00000000-1111-2222-3333-444444444444')
_IRQ_GATTC_CHARACTERISTIC_DONE
gattc_write
_IRQ_GATTC_WRITE_DONE
gap_disconnect: True
_IRQ_PERIPHERAL_DISCONNECT
gap_connect
_IRQ_PERIPHERAL_CONNECT
_IRQ_MTU_EXCHANGED 290
_IRQ_GATTC_NOTIFY 64 6
gattc_discover_characteristics
_IRQ_GATTC_CHARACTERISTIC_RESULT UUID('00000000-1111-2222-3333-444444444444')
_IRQ_GATTC_CHARACTERISTIC_DONE
_IRQ_GATTC_NOTIFY 47 3
gattc_write
_IRQ_GATTC_WRITE_DONE
gap_disconnect: True
Expand Down
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