Testing serial communication to RPi

[SloMusti]

The communication with RPi and setting the system time can be achieved with the following simple script:

Install first on stock raspbian lite: sudo apt-get install python-pip sudo pip install pyserial

disable ntp (must implement connectivity check later on) sudo systemctl stop systemd-timesyncd.service

#!/usr/bin/env python
import time
import serial
import subprocess

ser = serial.Serial(

   port=`/dev/ttyAMA0`,
   baudrate = 115200,
   parity=serial.PARITY_NONE,
   stopbits=serial.STOPBITS_ONE,
   bytesize=serial.EIGHTBITS,
   timeout=1
)
counter=0

while 1:
    x=ser.readline()
    if x.startswith("t:"):
        time= x[2:-1]
        print "Time found: " + time
        args = [`date`, `-s`, time]
        subprocess.Popen(args)
    elif x.startswith("p:"):
        print "Period found: " + x[2:-1]
    elif x.startswith("b:"):
        adc = float(x[2:])
        print("Battery: %2.2f V" % (adc*0.0164))

expected output:

Mon May 14 18:54:09 UTC 2018
Time found: Mon May 14 18:54:09 2018
Period found: 1752
Battery: 4.02 V