Working example.

adafruit_radio.py

@@ -123,8 +123,12 @@ def receive_full(self):
 
         :return: A tuple representation of the received message, or else None.
         """
-        for entry in self.ble.start_scan(
-                AdafruitRadio, minimum_rssi=-255, timeout=1
-            ):
-            now = time.monotonic()
-            return (entry.msg, entry.rssi, now)
+        try:
+            for entry in self.ble.start_scan(
+                    AdafruitRadio, minimum_rssi=-255, timeout=1
+                ):
+                now = time.monotonic()
+                return (entry.msg, entry.rssi, now)
+        finally:
+            self.ble.stop_scan()
+        return None

examples/radio_simpletest.py

@@ -0,0 +1,57 @@
+"""
+This demo uses the adafruit_radio module to send and receive messages.
+Devices are switched between broadcast and scanning using the slide switch.
+The buttons change the message to be sent.
+"""
+import digitalio
+import board
+from adafruit_radio import Radio
+
+
+slide_switch = digitalio.DigitalInOut(board.SLIDE_SWITCH)
+slide_switch.pull = digitalio.Pull.UP
+button_a = digitalio.DigitalInOut(board.BUTTON_A)
+button_a.pull = digitalio.Pull.DOWN
+button_b = digitalio.DigitalInOut(board.BUTTON_B)
+button_b.pull = digitalio.Pull.DOWN
+
+led = digitalio.DigitalInOut(board.D13)
+led.switch_to_output()
+
+msg = [
+    "hello",
+    "hi",
+    "foo",
+    "bar",
+    "baz",
+]
+
+i = 0
+r = Radio()
+
+while True:
+    if slide_switch.value:
+        print("Sending messages...")
+        while slide_switch.value:
+            last_i = i
+            if button_a.value:
+                i += 1
+            if button_b.value:
+                i -= 1
+            i %= len(msg)
+            m = msg[i]
+            print("Sending {}".format(m))
+            r.send(m)
+            # Alternative
+            # r.send_bytes(b"Arbitrary bytes")
+    else:
+        print("Scanning for messages...")
+        while not slide_switch.value:
+            m = r.receive_full()
+            if m:
+                print("Received message: {}".format(m))
+            # Alternative
+            # m = r.receive()
+            # if m:
+            #    print(m)
+