Issues with ESP now (Cardputer-Adv, UIFlow2.3.9)

[flowdev007]

Hi everyone!

having some problems with ESP now on the latest micro python UIFlow (2.3.9).

the simplest program I have is below, stripped right to the basics (just a loopback)

problem is the sends go through ok i.e. no exceptions but the receiver is not picking anything up.

I have tried a lot of things but no luck, any ideas would be greatly appreciated!

if anyone is running obvs change Mac address.

Thanks!!!

import network
from m5espnow import *  # Correct import for UIFlow firmware
from m5espnow import M5ESPNow
import time

# Callback: Fires automatically on incoming messages
def espnow_recv_callback(espnow_obj):
    sender_mac, data = espnow_obj.recv_data()  # sender_mac is hex str, data is bytes
    if data is not None:
        try:
            msg_text = data.decode('utf-8')
        except:
            msg_text = repr(data)
        print(f"[RECEIVED from {sender_mac}] {msg_text}")

# 1. WiFi setup (must be in this order for stability)
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.config(pm=0)  # Disable power saving
wlan.disconnect()  # Force disconnect to free radio
wlan.config(channel=11)  # Fixed channel (try 6 or 11 if interference)
time.sleep(0.5)  # Settle time

# 2. M5ESPNOW setup
e = M5ESPNow(11)  # Create instance (default wifi_ch=0)
e.set_irq_callback(espnow_recv_callback)  # Register callback
e.active(True)  # Activate ESP-NOW

# 3. Get own MAC as hex string (no colons, lowercase)
my_mac_bytes = wlan.config('mac')
my_mac_hex = ''.join(f'{b:02x}' for b in my_mac_bytes)
print("My MAC:", my_mac_hex)

# 4. Add self as peer (peer_mac: str, peer_id: 1, ifidx: 0, encrypt: False)
e.set_add_peer(my_mac_hex, 1, 0, False)

print("=== Starting loopback test (watch for RECEIVED lines) ===")

# 5. Send loop to self (peer_id=1)
counter = 0
while counter < 5:
    counter += 1
    msg = f"Hello from Cardputer! #{counter}".encode('utf-8')  # Bytes payload
    success = e.send_data(1, msg)  # Send to peer_id=1 (self)
    print(f"Sent #{counter} (success: {success})")
    time.sleep(2)  # Wait for callback to fire