aioble-l2cap: Raise correct error if l2cap disconnects during send.

If BLE disconnects in the middle of a send process, this change makes the
code raise `L2CAPDisconnectedError` rather than `TypeError` due to `_cid`
being `None`.

Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>

micropython/bluetooth/aioble-l2cap/manifest.py

@@ -1,4 +1,4 @@
-metadata(version="0.2.0")
+metadata(version="0.2.1")
 
 require("aioble-core")
 

micropython/bluetooth/aioble/aioble/l2cap.py

@@ -133,7 +133,6 @@ class L2CAPChannel:
     # Waits until the channel is free and then sends buf.
     # If the buffer is larger than the MTU it will be sent in chunks.
     async def send(self, buf, timeout_ms=None, chunk_size=None):
-        self._assert_connected()
         offset = 0
         chunk_size = min(self.our_mtu * 2, self.peer_mtu, chunk_size or self.peer_mtu)
         mv = memoryview(buf)
@@ -141,6 +140,7 @@ class L2CAPChannel:
             if self._stalled:
                 await self.flush(timeout_ms)
             # l2cap_send returns True if you can send immediately.
+            self._assert_connected()
             self._stalled = not ble.l2cap_send(
                 self._connection._conn_handle,
                 self._cid,

micropython/bluetooth/aioble/manifest.py

@@ -3,7 +3,7 @@
 # code. This allows (for development purposes) all the files to live in the
 # one directory.
 
-metadata(version="0.6.0")
+metadata(version="0.6.1")
 
 # Default installation gives you everything. Install the individual
 # components (or a combination of them) if you want a more minimal install.