spectrumLab python trying udp streaming

spectrumLab.py

import socket, time, math, struct
import numpy as np
import serial

UDP_IP = "127.0.0.1"
UDP_PORT = 6999

SAMPLE_RATE = 48000
PACKET_SIZE = 10000
PACKET_DURATION = PACKET_SIZE/SAMPLE_RATE
print("Packet duration=", PACKET_DURATION)
SINE_FREQUENCY = 1000
AMPLITUDE = 0.5

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind(("0.0.0.0", UDP_PORT+1))
#ser = serial.Serial('COM19', 921600, timeout=0)
current_phase = 0

print("starting udp stream")
try:
    while True:
        t = np.linspace(current_phase, current_phase+PACKET_DURATION, PACKET_SIZE, endpoint=None)
        #print(t)
        sample_float = AMPLITUDE * np.sin(2*math.pi*SINE_FREQUENCY*t)
        current_phase += PACKET_DURATION
        sample_int16 = np.int16(sample_float*32767)
        packed_data = struct.pack("<"+str(PACKET_SIZE)+"h",*sample_int16)
        #print(packed_data)
        #print(len(packed_data))
        sock.sendto(packed_data,(UDP_IP, UDP_PORT))
        #ser.write(packed_data)
        time_to_sleep = PACKET_DURATION
        if time_to_sleep > 0:
            #print(time_to_sleep)
            time.sleep(0.2)
            pass

except KeyboardInterrupt:
    print("stopping")
    pass
finally:
    sock.close()
    #ser.close()

works with ffplay.exe -stats -ar 48000 -analyzeduration 0 -probesize 32 -f s16le -i udp://127.0.0.1:6999