aioble: Add a shutdown handler for cleanup.

This allows `aioble.stop()` to reset all internal state.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

Author: jimmo

micropython/bluetooth/aioble/aioble/central.py

@@ -86,7 +86,13 @@ def _central_irq(event, data):
             connection._event.set()
 
 
-register_irq_handler(_central_irq)
+def _central_shutdown():
+    global _active_scanner, _connecting
+    _active_scanner = None
+    _connecting = set()
+
+
+register_irq_handler(_central_irq, _central_shutdown)
 
 
 # Cancel an in-progress scan.

micropython/bluetooth/aioble/aioble/client.py

@@ -78,7 +78,7 @@ def _client_irq(event, data):
         ClientCharacteristic._on_indicate(conn_handle, value_handle, bytes(indicate_data))
 
 
-register_irq_handler(_client_irq)
+register_irq_handler(_client_irq, None)
 
 
 # Async generator for discovering services, characteristics, descriptors.

micropython/bluetooth/aioble/aioble/core.py

@@ -43,17 +43,24 @@ def config(*args, **kwargs):
     return ble.config(*args, **kwargs)
 
 
-def stop():
-    ble.active(False)
+# Because different functionality is enabled by which files are available the
+# different modules can register their IRQ handlers and shutdown handlers
+# dynamically.
+_irq_handlers = []
+_shutdown_handlers = []
 
 
-# Because different functionality is enabled by which files are available
-# the different modules can register their IRQ handlers dynamically.
-_irq_handlers = []
+def register_irq_handler(irq, shutdown):
+    if irq:
+        _irq_handlers.append(irq)
+    if shutdown:
+        _shutdown_handlers.append(shutdown)
 
 
-def register_irq_handler(handler):
-    _irq_handlers.append(handler)
+def stop():
+    ble.active(False)
+    for handler in _shutdown_handlers:
+        handler()
 
 
 # Dispatch IRQs to the registered sub-modules.

micropython/bluetooth/aioble/aioble/device.py

@@ -26,7 +26,7 @@ def _device_irq(event, data):
                 device._mtu_event.set()
 
 
-register_irq_handler(_device_irq)
+register_irq_handler(_device_irq, None)
 
 
 # Context manager to allow an operation to be cancelled by timeout or device

micropython/bluetooth/aioble/aioble/l2cap.py

@@ -54,7 +54,12 @@ def _l2cap_irq(event, data):
             channel._event.set()
 
 
-register_irq_handler(_l2cap_irq)
+def _l2cap_shutdown():
+    global _listening
+    _listening = False
+
+
+register_irq_handler(_l2cap_irq, _l2cap_shutdown)
 
 
 # The channel was disconnected during a send/recvinto/flush.

micropython/bluetooth/aioble/aioble/peripheral.py

@@ -63,7 +63,13 @@ def _peripheral_irq(event, data):
             connection._event.set()
 
 
-register_irq_handler(_peripheral_irq)
+def _peripheral_shutdown():
+    global _incoming_connection, _connect_event
+    _incoming_connection = None
+    _connect_event = None
+
+
+register_irq_handler(_peripheral_irq, _peripheral_shutdown)
 
 
 # Advertising payloads are repeated packets of the following form:

micropython/bluetooth/aioble/aioble/security.py

@@ -149,7 +149,14 @@ def _security_irq(event, data):
         #     log_warn("unknown passkey action")
 
 
-register_irq_handler(_security_irq)
+def _security_shutdown():
+    global _secrets, _modified, _path
+    _secrets = {}
+    _modified = False
+    _path = None
+
+
+register_irq_handler(_security_irq, _security_shutdown)
 
 
 # Use device.pair() rather than calling this directly.

micropython/bluetooth/aioble/aioble/server.py

@@ -56,7 +56,12 @@ def _server_irq(event, data):
         Characteristic._indicate_done(conn_handle, value_handle, status)
 
 
-register_irq_handler(_server_irq)
+def _server_shutdown():
+    global _registered_characteristics
+    _registered_characteristics = {}
+
+
+register_irq_handler(_server_irq, _server_shutdown)
 
 
 class Service: