extmod/modbluetooth: Implement read done event.

On btstack there's no status associated with the read result, it comes
through as a separate event.  This allows you to detect read failures or
timeouts.

examples/bluetooth/ble_temperature_central.py

@@ -161,6 +161,10 @@ class BLETemperatureCentral:
                     self._read_callback(self._value)
                     self._read_callback = None
 
+        elif event == _IRQ_GATTC_READ_DONE:
+            # Read completed.
+            conn_handle, value_handle, status = data
+
         elif event == _IRQ_GATTC_NOTIFY:
             # The ble_temperature.py demo periodically notifies its value.
             conn_handle, value_handle, notify_data = data

extmod/btstack/modbluetooth_btstack.c

@@ -171,8 +171,6 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
                    irq == MP_BLUETOOTH_IRQ_GATTC_CHARACTERISTIC_DONE ||
                    irq == MP_BLUETOOTH_IRQ_GATTC_DESCRIPTOR_DONE) {
             mp_bluetooth_gattc_on_discover_complete(irq, conn_handle, status);
-        } else {
-            // Note that query complete is fired for other operations like query value too.
         }
     } else if (event_type == GATT_EVENT_SERVICE_QUERY_RESULT) {
         DEBUG_EVENT_printf("  --> gatt service query result\n");
@@ -262,6 +260,13 @@ STATIC void btstack_packet_handler_discover_descriptors(uint8_t packet_type, uin
     btstack_packet_handler(packet_type, packet, MP_BLUETOOTH_IRQ_GATTC_DESCRIPTOR_DONE);
 }
 
+// For when the handler is being used for a read query.
+STATIC void btstack_packet_handler_read(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
+    (void)channel;
+    (void)size;
+    btstack_packet_handler(packet_type, packet, MP_BLUETOOTH_IRQ_GATTC_READ_DONE);
+}
+
 // For when the handler is being used for write-with-response.
 STATIC void btstack_packet_handler_write_with_response(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
     (void)channel;
@@ -740,7 +745,7 @@ int mp_bluetooth_gattc_discover_descriptors(uint16_t conn_handle, uint16_t start
 
 int mp_bluetooth_gattc_read(uint16_t conn_handle, uint16_t value_handle) {
     DEBUG_EVENT_printf("mp_bluetooth_gattc_read\n");
-    return btstack_error_to_errno(gatt_client_read_value_of_characteristic_using_value_handle(&btstack_packet_handler_generic, conn_handle, value_handle));
+    return btstack_error_to_errno(gatt_client_read_value_of_characteristic_using_value_handle(&btstack_packet_handler_read, conn_handle, value_handle));
 }
 
 int mp_bluetooth_gattc_write(uint16_t conn_handle, uint16_t value_handle, const uint8_t *value, size_t *value_len, unsigned int mode) {

extmod/modbluetooth.c

@@ -898,7 +898,7 @@ STATIC mp_obj_t bluetooth_ble_invoke_irq(mp_obj_t none_in) {
         } else if (event == MP_BLUETOOTH_IRQ_GATTC_READ_RESULT || event == MP_BLUETOOTH_IRQ_GATTC_NOTIFY || event == MP_BLUETOOTH_IRQ_GATTC_INDICATE) {
             // conn_handle, value_handle, data
             ringbuf_extract(&o->ringbuf, data_tuple, 2, 0, NULL, 0, NULL, &o->irq_data_data);
-        } else if (event == MP_BLUETOOTH_IRQ_GATTC_WRITE_DONE) {
+        } else if (event == MP_BLUETOOTH_IRQ_GATTC_READ_DONE || event == MP_BLUETOOTH_IRQ_GATTC_WRITE_DONE) {
             // conn_handle, value_handle, status
             ringbuf_extract(&o->ringbuf, data_tuple, 3, 0, NULL, 0, NULL, NULL);
         #endif // MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
@@ -1090,10 +1090,10 @@ void mp_bluetooth_gattc_on_data_available_end(mp_uint_t atomic_state) {
     schedule_ringbuf(atomic_state);
 }
 
-void mp_bluetooth_gattc_on_write_status(uint16_t conn_handle, uint16_t value_handle, uint16_t status) {
+void mp_bluetooth_gattc_on_read_write_status(uint8_t event, uint16_t conn_handle, uint16_t value_handle, uint16_t status) {
     MICROPY_PY_BLUETOOTH_ENTER
     mp_obj_bluetooth_ble_t *o = MP_OBJ_TO_PTR(MP_STATE_VM(bluetooth));
-    if (enqueue_irq(o, 2 + 2 + 2, MP_BLUETOOTH_IRQ_GATTC_WRITE_DONE)) {
+    if (enqueue_irq(o, 2 + 2 + 2, event)) {
         ringbuf_put16(&o->ringbuf, conn_handle);
         ringbuf_put16(&o->ringbuf, value_handle);
         ringbuf_put16(&o->ringbuf, status);

extmod/modbluetooth.h

@@ -276,8 +276,8 @@ size_t mp_bluetooth_gattc_on_data_available_start(uint8_t event, uint16_t conn_h
 void mp_bluetooth_gattc_on_data_available_chunk(const uint8_t *data, size_t data_len);
 void mp_bluetooth_gattc_on_data_available_end(mp_uint_t atomic_state);
 
-// Notify modbluetooth that a write has completed.
-void mp_bluetooth_gattc_on_write_status(uint16_t conn_handle, uint16_t value_handle, uint16_t status);
+// Notify modbluetooth that a read or write operation has completed.
+void mp_bluetooth_gattc_on_read_write_status(uint8_t event, uint16_t conn_handle, uint16_t value_handle, uint16_t status);
 #endif
 
 // For stacks that don't manage attribute value data (currently all of them), helpers

extmod/nimble/modbluetooth_nimble.c

@@ -844,6 +844,7 @@ STATIC int ble_gatt_attr_read_cb(uint16_t conn_handle, const struct ble_gatt_err
     if (error->status == 0) {
         gattc_on_data_available(MP_BLUETOOTH_IRQ_GATTC_READ_RESULT, conn_handle, attr->handle, attr->om);
     }
+    mp_bluetooth_gattc_on_read_write_status(MP_BLUETOOTH_IRQ_GATTC_READ_DONE, conn_handle, attr->handle, error->status);
     return 0;
 }
 
@@ -861,7 +862,7 @@ STATIC int ble_gatt_attr_write_cb(uint16_t conn_handle, const struct ble_gatt_er
     if (!mp_bluetooth_is_active()) {
         return 0;
     }
-    mp_bluetooth_gattc_on_write_status(conn_handle, attr->handle, error->status);
+    mp_bluetooth_gattc_on_read_write_status(MP_BLUETOOTH_IRQ_GATTC_WRITE_DONE, conn_handle, attr->handle, error->status);
     return 0;
 }