more tests for bleak, and filename change

bricknil/bleak_interface.py

@@ -0,0 +1,91 @@
+# Copyright 2019 Virantha N. Ekanayake 
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+# http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Interface to the BLEAK library in Linux for BLE calls
+
+"""
+import curio, asyncio, threading, logging
+
+import bleak
+#from bleak import BleakClient
+
+class Bleak:
+    """Interface class between curio loop and asyncio loop running bleak
+       
+       This class is basically just a queue interface.  It has two queue, 
+       one for incoming messages `in_queue` and one for outgoing messages `out_queue`.
+
+       A loop running in asyncio's event_loop waits for messages on the `in_queue`.
+
+       The `out_queue` is used to respond to "discover" and "connect" messages with the
+       list of discovered devices and a connected device respectively.  All messages
+       incoming from a device are relayed directly to a call back function, and does
+       not go through either of these queues.
+
+
+    """
+
+    def __init__(self):
+        # Need to start an event loop
+        self.in_queue = curio.UniversalQueue()  # Incoming message queue
+        self.out_queue = curio.UniversalQueue()  # Outgoing message queue
+
+        self.devices = []
+        #self.loop = threading.Thread(target=self.run, daemon=True)
+        #self.loop.start()
+
+    def run(self):
+        #self.loop = asyncio.new_event_loop()
+        #asyncio.set_event_loop(self.loop)
+        self.loop = asyncio.get_event_loop()
+        self.loop.run_until_complete(self.asyncio_loop())
+
+    async def asyncio_loop(self):
+
+        # Wait for messages on in_queue
+        done = False
+        while not done:
+            msg = await self.in_queue.get()
+            if isinstance(msg, tuple):
+                msg, val = msg
+            await self.in_queue.task_done()
+            if msg == 'discover':
+                print('Awaiting on bleak discover')
+                devices = await bleak.discover(timeout=1, loop=self.loop)
+                print('Done Awaiting on bleak discover')
+                await self.out_queue.put(devices)
+            elif msg == 'connect':
+                device = bleak.BleakClient(address=val, loop=self.loop)
+                self.devices.append(device)
+                await device.connect()
+                await self.out_queue.put(device)
+            elif msg == 'tx':
+                device, char_uuid, msg_bytes = val
+                await device.write_gatt_char(char_uuid, msg_bytes)
+            elif msg == 'notify':
+                device, char_uuid, msg_handler = val
+                await device.start_notify(char_uuid, msg_handler)
+            elif msg =='quit':
+                print("quitting")
+                logging.info('quitting')
+                for device in self.devices:
+                    await device.disconnect()
+                done = True
+                print("quit")
+            else:
+                print(f'Unknown message to Bleak: {msg}')
+
+
+
+