update python examples

RPi/pyRF24Network/examples/helloworld_rx.py

@@ -1,7 +1,6 @@
 """Simplest possible example of using RF24Network in RX role.
 Listens for messages from the transmitter and prints them out.
 """
-import time
 import struct
 from RF24 import RF24
 from RF24Network import RF24Network
@@ -45,20 +44,17 @@
 radio.printPrettyDetails()
 
 radio.startListening()  # put radio in RX mode
-start = time.monotonic()
-while time.monotonic() - start <= 6:  # listen for 6 seconds
-    network.update()
-    while network.available():
-        header, payload = network.read(8)
-        print("payload length ", len(payload))
-        millis, number = struct.unpack('<LL', bytes(payload))
-        print(
-            "Received payload {} from {} to {} at (origin's timestamp) {}".format(
-                number,
-                oct(header.from_node),
-                oct(header.to_node),
-                millis,
+try:
+    while True:
+        network.update()
+        while network.available():
+            header, payload = network.read(8)
+            print("payload length ", len(payload))
+            millis, number = struct.unpack("<LL", bytes(payload))
+            print(
+                f"Received payload {number} from {oct(header.from_node)}",
+                f"to {oct(header.to_node)} at (origin's timestamp) {millis}",
             )
-        )
-        start = time.monotonic()
-    time.sleep(0.05)
+except KeyboardInterrupt:
+    print("powering down radio and exiting.")
+    radio.powerDown()

RPi/pyRF24Network/examples/helloworld_tx.py

@@ -49,13 +49,17 @@
 packets_sent = 0
 last_sent = 0
 
-while 1:
-    network.update()
-    now = time.monotonic_ns() / 1000
-    # If it's time to send a message, send it!
-    if now - last_sent >= interval:
-        last_sent = now
-        payload = struct.pack('<LL', now, packets_sent)
-        packets_sent += 1
-        ok = network.write(RF24NetworkHeader(other_node), payload)
-        print("Sending %d..." % packets_sent, "ok." if ok else "failed.")
+try:
+    while True:
+        network.update()
+        now = int(time.monotonic_ns() / 1000000)
+        # If it's time to send a message, send it!
+        if now - last_sent >= interval:
+            last_sent = now
+            packets_sent += 1
+            payload = struct.pack("<LL", now, packets_sent)
+            ok = network.write(RF24NetworkHeader(other_node), payload)
+            print(f"Sending {packets_sent}...", "ok." if ok else "failed.")
+except KeyboardInterrupt:
+    print("powering down radio and exiting.")
+    radio.powerDown()