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extmod/modbluetooth: Add event for "indicate acknowledgement".

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This commit adds the IRQ_GATTS_INDICATE_DONE BLE event which will be raised
with the status of gatts_indicate (unlike notify, indications require
acknowledgement).

An example of its use is added to ble_temperature.py, and to the multitests
in ble_characteristic.py.

Implemented for btstack and nimble bindings, tested in both directions
between unix/btstack and pybd/nimble.
This commit is contained in:
Jim Mussared
2020-07-20 16:58:10 +10:00
committed by Damien George
parent 3c7ca2004c
commit 9d823a5d9a
7 changed files with 94 additions and 16 deletions
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19
examples/bluetooth/ble_temperature.py
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@@ -13,13 +13,14 @@ from micropython import const
_IRQ_CENTRAL_CONNECT = const(1)
_IRQ_CENTRAL_DISCONNECT = const(2)
_IRQ_GATTS_INDICATE_DONE = const(20)
# org.bluetooth.service.environmental_sensing
_ENV_SENSE_UUID = bluetooth.UUID(0x181A)
# org.bluetooth.characteristic.temperature
_TEMP_CHAR = (
bluetooth.UUID(0x2A6E),
bluetooth.FLAG_READ | bluetooth.FLAG_NOTIFY,
bluetooth.FLAG_READ | bluetooth.FLAG_NOTIFY | bluetooth.FLAG_INDICATE,
)
_ENV_SENSE_SERVICE = (
_ENV_SENSE_UUID,
@@ -52,15 +53,21 @@ class BLETemperature:
self._connections.remove(conn_handle)
# Start advertising again to allow a new connection.
self._advertise()
elif event == _IRQ_GATTS_INDICATE_DONE:
conn_handle, value_handle, status, = data
def set_temperature(self, temp_deg_c, notify=False):
def set_temperature(self, temp_deg_c, notify=False, indicate=False):
# Data is sint16 in degrees Celsius with a resolution of 0.01 degrees Celsius.
# Write the local value, ready for a central to read.
self._ble.gatts_write(self._handle, struct.pack("<h", int(temp_deg_c * 100)))
if notify:
if notify or indicate:
for conn_handle in self._connections:
# Notify connected centrals to issue a read.
self._ble.gatts_notify(conn_handle, self._handle)
if notify:
# Notify connected centrals.
self._ble.gatts_notify(conn_handle, self._handle)
if indicate:
# Indicate connected centrals.
self._ble.gatts_indicate(conn_handle, self._handle)
def _advertise(self, interval_us=500000):
self._ble.gap_advertise(interval_us, adv_data=self._payload)
@@ -76,7 +83,7 @@ def demo():
while True:
# Write every second, notify every 10 seconds.
i = (i + 1) % 10
temp.set_temperature(t, notify=i == 0)
temp.set_temperature(t, notify=i == 0, indicate=False)
# Random walk the temperature.
t += random.uniform(-0.5, 0.5)
time.sleep_ms(1000)