from time import sleep
import serial
import ast


def datagram_to_dict(data):
    """Décode le message.
    Retourne un dict ou None
    """

    try:
        dec = data.decode("utf-8")
    except:
        print("Décodage UTF-8 impossible")
        dec = data

    try:
        msg = ast.literal_eval(dec)
    except:
        print("ast.literal_eval impossible")
        print("Ajouter ast dans les import")
        msg = dec

    if isinstance(msg, dict):
        return msg
    else:
        print("Message reçu: None")
        return None

init = 1
while init:
    try:
        print("Connexion à ttyACM0 ....")
        sleep(1)
        seri = serial.Serial('/dev/ttyACM0', 9600, timeout=1)
        print("Connecté à ttyACM0")
        init = 0
    except:
        print("Connexion impossibble à ttyACM0")

while True:
    rcv = seri.readline()

    data = datagram_to_dict(rcv)