extmod/modbluetooth: Add discover complete events for svc/char/desc.

Without this it's difficult to implement a state machine correctly if the
desired services are not found.

1 files changed, 16 insertions, 1 deletions

diff --git a/examples/bluetooth/ble_temperature_central.py b/examples/bluetooth/ble_temperature_central.py
index 8b679b9b80..19dc93409e 100644
--- a/examples/bluetooth/ble_temperature_central.py
+++ b/examples/bluetooth/ble_temperature_central.py
@@ -80,6 +80,8 @@ class BLETemperatureCentral:
 
         # Connected device.
         self._conn_handle = None
+        self._start_handle = None
+        self._end_handle = None
         self._value_handle = None
 
     def _irq(self, event, data):
@@ -124,18 +126,31 @@ class BLETemperatureCentral:
             # Connected device returned a service.
             conn_handle, start_handle, end_handle, uuid = data
             if conn_handle == self._conn_handle and uuid == _ENV_SENSE_UUID:
+                self._start_handle, self._end_handle = start_handle, end_handle
+
+        elif event == _IRQ_GATTC_SERVICES_DONE:
+            # Service query complete.
+            if self._start_handle and self._end_handle:
                 self._ble.gattc_discover_characteristics(
-                    self._conn_handle, start_handle, end_handle
+                    self._conn_handle, self._start_handle, self._end_handle
                 )
+            else:
+                print("Failed to find environmental sensing service.")
 
         elif event == _IRQ_GATTC_CHARACTERISTIC_RESULT:
             # Connected device returned a characteristic.
             conn_handle, def_handle, value_handle, properties, uuid = data
             if conn_handle == self._conn_handle and uuid == _TEMP_UUID:
                 self._value_handle = value_handle
+
+        elif event == _IRQ_GATTC_CHARACTERISTICS_DONE:
+            # Characteristic query complete.
+            if self._value_handle:
                 # We've finished connecting and discovering device, fire the connect callback.
                 if self._conn_callback:
                     self._conn_callback()
+            else:
+                print("Failed to find temperature characteristic.")
 
         elif event == _IRQ_GATTC_READ_RESULT:
             # A read completed successfully.