#!/usr/bin/python3
# -*- coding: utf-8 -* 
#Bertrand Vandeportaele 2021

#struct — Interpret strings as packed binary data
#https://docs.python.org/2/library/struct.html
#https://stackoverflow.com/questions/37093485/how-to-interpret-4-bytes-as-a-32-bit-float-using-python/37093610

import struct
#https://waytolearnx.com/2020/06/socket-udp-client-serveur-avec-python.html
import socket
import time

destIP='127.0.0.1' 
portOut=9999

numero=1
val1=3.14159;
val2=1.23456;
val3=8.654231;
addrPort = (destIP, portOut)
bufferSize = 1024
# Créer un socket UDP coté client
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
while True:
    #<I pour unsigned int sur 32bits et  <f pour flottant 32 bits
    list1=struct.pack('<I',numero )+struct.pack('<f',val1 )+struct.pack('<f',val2 )+struct.pack('<f',val3 ) #encodage
    #valreconstruite=struct.unpack('<Ifff', bytearray(list1)) #test de décodage
    #for i in range(4):
    #    print(valreconstruite[i])
    #    print(type(valreconstruite[i]))    
    # Envoyer au serveur à l'aide du socket UDP créé
    s.sendto(list1, addrPort)
    numero=numero+1
    val1=val1+0.3;
    val2=val2;
    val3=val1+val2;
    time.sleep(0.1);