here is my sigfox code, am I doing something wrong that let the Sigfox/LoRa modem in Sigfox mode ?

def run_sigfox :
    RX = False    
     # create a Sigfox socket
     s = socket.socket(socket.AF_SIGFOX, socket.SOCK_RAW)
     # make the socket blocking
     s.setblocking(True)
     # configure it as uplink only (if False)
     s.setsockopt(socket.SOL_SIGFOX, socket.SO_RX, RX)
     cnt = nvs_get('sigfox_cnt')
     message = payload_encode(channel_ids['cnt'],'H', cnt)
     cnt += 1
     nvs_set('sigfox_cnt', cnt)
     message += payload_encode(channel_ids['time'],'I', time.time())
     s.send(message)
     s.close()