Add the device match check to find devices.

Leave the example only in the section it is used.

ch-13/2.3-bluetooth/find_devices.py

@@ -7,7 +7,11 @@ async def run():
     devices = await bleak.BleakScanner.discover(service_uuids=[ble_uuid])
     print(f"Found {len(devices)} devices")
     print([device.name for device in devices])
-    ble_device_info = [device for device in devices if device.name==ble_name][0]
+    matching_devices = [device for device in devices if device.name==ble_name]
+    if len(matching_devices) == 0):
+        print(f"Could not find robot at {ble_name}")
+        return
+    ble_device_info = matching_devices[0]
     print(f"Found robot {ble_device_info.name}...")
 
 asyncio.run(run())

ch-13/3.1-displaying-a-pose/find_devices.py

@@ -1,13 +0,0 @@
-import asyncio
-import bleak
-
-async def run():
-    ble_uuid = "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"
-    ble_name = "Adafruit Bluefruit LE"
-    devices = await bleak.BleakScanner.discover(service_uuids=[ble_uuid])
-    print(f"Found {len(devices)} devices")
-    print([device.name for device in devices])
-    ble_device_info = [device for device in devices if device.name==ble_name][0]
-    print(f"Found robot {ble_device_info.name}...")
-
-asyncio.run(run())

ch-13/3.2-collision-avoidance/display_from_robot.py

@@ -1,73 +0,0 @@
-import asyncio
-import json
-import numpy as np
-import matplotlib.pyplot as plt
-from matplotlib.widgets import Button
-
-from robot_ble_connection import BleConnection
-
-
-class RobotDisplay:
-    def __init__(self):
-        self.ble_connection = BleConnection(self.handle_data)
-        self.buffer = ""
-        self.arena = {}
-        self.closed = False
-        self.fig, self.ax = plt.subplots()
-        self.poses = None
-
-    def handle_close(self, _):
-        self.closed = True
-
-    def handle_data(self, data):
-        self.buffer += data.decode("utf-8")
-        while "\n" in self.buffer:
-            line, self.buffer = self.buffer.split("\n", 1)
-            print(f"Received data: {line}")
-            try:
-                message = json.loads(line)
-            except ValueError:
-                print("Error parsing JSON")
-                return
-            if "arena" in message:
-                self.arena = message
-            if "poses" in message:
-                self.poses = np.array(message["poses"], dtype=np.int16)
-
-    def draw(self):
-        self.ax.clear()
-        if self.arena:
-            for line in self.arena["arena"]:
-                self.ax.plot(
-                    [line[0][0], line[1][0]], [line[0][1], line[1][1]], color="black"
-                )
-        if self.poses is not None:
-            self.ax.scatter(self.poses[:,0], self.poses[:,1], color="blue")
-
-    async def send_command(self, command):
-        request = (json.dumps({"command": command})  ).encode()
-        print(f"Sending request: {request}")
-        await self.ble_connection.send_uart_data(request)
-
-    def start(self, _):
-        self.button_task = asyncio.create_task(self.send_command("start"))
-
-    async def main(self):
-        plt.ion()
-        await self.ble_connection.connect()
-        try:
-            await self.send_command("arena")
-            self.fig.canvas.mpl_connect("close_event", self.handle_close)
-            start_button = Button(plt.axes([0.7, 0.05, 0.1, 0.075]), "Start")
-            start_button.on_clicked(self.start)
-            while not self.closed:
-                self.draw()
-                plt.draw()
-                plt.pause(0.05)
-                await asyncio.sleep(0.01)
-        finally:
-            await self.ble_connection.close()
-
-
-robot_display = RobotDisplay()
-asyncio.run(robot_display.main())

ch-13/3.2-collision-avoidance/find_devices.py

@@ -1,13 +0,0 @@
-import asyncio
-import bleak
-
-async def run():
-    ble_uuid = "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"
-    ble_name = "Adafruit Bluefruit LE"
-    devices = await bleak.BleakScanner.discover(service_uuids=[ble_uuid])
-    print(f"Found {len(devices)} devices")
-    print([device.name for device in devices])
-    ble_device_info = [device for device in devices if device.name==ble_name][0]
-    print(f"Found robot {ble_device_info.name}...")
-
-asyncio.run(run())

ch-13/3.3-moving-with-encoders/find_devices.py

@@ -1,13 +0,0 @@
-import asyncio
-import bleak
-
-async def run():
-    ble_uuid = "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"
-    ble_name = "Adafruit Bluefruit LE"
-    devices = await bleak.BleakScanner.discover(service_uuids=[ble_uuid])
-    print(f"Found {len(devices)} devices")
-    print([device.name for device in devices])
-    ble_device_info = [device for device in devices if device.name==ble_name][0]
-    print(f"Found robot {ble_device_info.name}...")
-
-asyncio.run(run())