Simple demo of ESPnow broadcast function on CircuitPython

espnow_simple_hacky_receiver.py

# espnow-simple_hacky_receiver.py -- show ESPnow working broadcast on CircuitPython
# 9 Jul 2025 - @todbot
# tested on QTPY ESP32-S2 and FunHouse (ESP32-S2)
import time
import wifi
import espnow

# https://github.com/adafruit/circuitpython/issues/9380#issuecomment-2463013607
# hack to switch channel that is used for ESPNow
# this takes just a few milliseconds, so doesn't waste a lot of power
wifi.radio.start_ap(" ", "", channel=6, max_connections=0)
wifi.radio.stop_ap()

e = espnow.ESPNow()

while True:
    time.sleep(0.3)
    print("loop")
    if not e:   # returns True if packet
        continue
    
    packet = e.read()
    print("packet:", packet.msg, packet)

espnow_simple_hacky_sender.py

# espnow-simple_hacky_sender.py -- show ESPnow broadcast working on CircuitPython
# 9 Jul 2025 - @todbot
# tested on QTPY ESP32-S2 and FunHouse (ESP32-S2)

import time
import wifi
import espnow

# https://github.com/adafruit/circuitpython/issues/9380#issuecomment-2463013607
# hack to switch channel that is used for ESPNow
# this takes just a few milliseconds, so doesn't waste a lot of power
wifi.radio.start_ap(" ", "", channel=6, max_connections=0)
wifi.radio.stop_ap()

e = espnow.ESPNow()
peer = espnow.Peer(mac=b'\xff\xff\xff\xff\xff\xff', channel=6)  # broadcast
e.peers.append(peer)

print("here we go")

while True:
    print("sending", time.monotonic())
    try: 
        e.send("Hello there %.1f" %time.monotonic(), peer) # note extra peer arg
    except Exception as ex:
        print("ex:",ex)

    time.sleep(2)