solar_collector/scripts/rpi_serial.py

#!/usr/bin/python3.7

import re, serial, logging, datetime
from influxdb import InfluxDBClient

# Logging 
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)
handler = logging.FileHandler('rpi_serial.log')
handler.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setFormatter(formatter)
logger.addHandler(handler)

# InfluxDB
client = InfluxDBClient(host="localhost", port=8086)
client.switch_database("solar")

# Regex Prep
regex = r"(\d{2}\.\d{2}\.\d{4})\s*(\d{2}:\d{2}:\d{2})\s*(\d{1,2})\s*(\d+\.\d{1})\s*(\d+\.\d{2})\s*(\d+)\s*(\d+\.\d{1})\s*(\d+\.\d{2})\s*(\d+)\s*(\d+)"
pattern = re.compile(regex)

# Setup
serial_port = '/dev/ttyUSB0'

def field_janitor(value_list):
    fields = {'mode': value_list[0][2],
              'generatorspannung': float(value_list[0][3]),
              'generatorstrom': float(value_list[0][4]),
              'generatorleistung': float(value_list[0][5]),
              'netzspannung': float(value_list[0][6]),
              'netzstrom': float(value_list[0][7]),
              'eingespeiste_leistung': float(value_list[0][8]),
              'temperatur': float(value_list[0][9]) }
    return fields

try:
    ser = serial.Serial(serial_port)
    logger.info("Connected to Serial Port, start polling")
except:
    logger.error("Couldn't connect to serial port {}".format(serial_port))
    raise

while True:
    line = ser.readline().decode('utf-8')
    print(line)
    value_list = pattern.findall(line)
    print(len(value_list))
    if value_list and len(value_list[0]) == 10:
        measure = {}
        measure['measurement'] = "Tannenstrasse"
        date = datetime.datetime.strptime(value_list[0][0] + "-" + value_list[0][1], "%d.%m.%Y-%X").strftime('%s')
        measure['time'] = int(date) - 3600
        measure['fields'] = field_janitor(value_list)
        client.write_points([measure], time_precision="s")
    else:
        logger.warning("received invalid line: {}".format(line))