import serial
from threading import Thread

s = serial.Serial(
    port    = 'COM3',
    baudrate= 9600,
)
print('[+] connected')
buffer = []
def cb_recv():
    while True:
        l = s.readline().decode(encoding='ascii', errors='ignore')
        buffer.append(l)
Thread(target=cb_recv).start()
while True:
    if len(buffer) != 0:
        for l in buffer:
            print('received:', l)
        buffer.clear()
    inst = input("Input:")
    tokens = inst.split(' ')
    if tokens[0] == 'i': # inject a code
        with open(tokens[1], 'rb') as f:
            s.write(f.read())
    elif tokens[0] == 's': # input string
        type    = int(tokens[1])
        msg     = tokens[2].encode(encoding='ascii')
        payload = bytes([len(msg), type]) + msg
        print('sent:', payload)
        s.write(payload)
    elif tokens[0] == 'q': # quit
        s.close()
        break