RF24Mesh_Example.py
examples_RPi/RF24Mesh_Example.py
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70 | """
Simplest RF24Mesh example that transmits a time stamp (in milliseconds) 1 per second.
"""
import sys
import time
import struct
from RF24 import RF24, RF24_PA_MIN
from RF24Network import RF24Network
from RF24Mesh import RF24Mesh
start = time.monotonic()
def millis():
""":Returns: Delta time since started example in milliseconds. Wraps value around
the width of a ``long`` integer."""
return int((time.monotonic() - start) * 1000) % (2**32)
# radio setup for RPi B Rev2: CS0=Pin 24
radio = RF24(22, 0)
network = RF24Network(radio)
mesh = RF24Mesh(radio, network)
mesh.setNodeID(4)
# Set the PA Level to MIN and disable LNA for testing & power supply related issues
radio.begin()
radio.setPALevel(RF24_PA_MIN, 0)
print("starting nodeID", mesh.getNodeID())
if not mesh.begin():
if radio.isChipConnected():
try:
print("Could not connect to network.\nConnecting to mesh...")
while mesh.renewAddress() == 0o4444:
print("Could not connect to network.\nConnecting to mesh...")
except KeyboardInterrupt:
radio.powerDown()
sys.exit()
else:
raise OSError("Radio hardware not responding or could not connect to mesh.")
radio.printDetails()
TIMER = 0
try:
while True:
# Call mesh.update to keep the network updated
mesh.update()
if (millis() - TIMER) >= 1000:
TIMER = millis()
if not mesh.write(struct.pack("L", TIMER), ord("M")):
# If a write fails, check connectivity to the mesh network
if not mesh.checkConnection():
# The address could be refreshed per a specified time frame
# or only when sequential writes fail, etc.
print("Send fail. Renewing Address...")
while mesh.renewAddress() == 0o4444:
print("Renewing Address...")
else:
print("Send fail, Test OK")
else:
print("Send OK:", TIMER)
time.sleep(0.001) # delay 1 ms
except KeyboardInterrupt:
print("powering down radio and exiting.")
radio.powerDown()
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