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import os
import sys
import time
import datetime
import minimalmodbus
from influxdb import InfluxDBClient

minimalmodbus.CLOSE_PORT_AFTER_EACH_CALL=True

PORT_NAME           = 'com7'
SLAVE1_ADDRESS       = 1
SLAVE2_ADDRESS       = 2
SLAVE3_ADDRESS       = 3
BAUDRATE            = 9600 # baud (pretty much bits/s).
TIMEOUT             = 2 # seconds.
STOPBITS            = 1
PARITY              = 'N'
MODE                = minimalmodbus.MODE_RTU

instrument1 = minimalmodbus.Instrument(PORT_NAME, SLAVE3_ADDRESS, MODE)
instrument1.serial.baudrate = BAUDRATE
instrument1.serial.timeout = TIMEOUT
instrument1.serial.stopbits = STOPBITS
instrument1.serial.parity = PARITY
instrument1.serial.xonxoff = False
instrument1.serial.rtscts = False
instrument1.serial.dsrdtr = False
instrument1.debug = False
instrument1.precalculate_read_size = True


influx_host = 'localhost'
port = 8086
dbname = "environment"
user = "root"
password = "root"

# Generates the necessary payload to post
# temperature data into the InfluxDB
def get_data_points(temperature):

    iso = time.ctime()
    json_body = [
            {
                "measurement": "ambient_celcius",
                "tags": {"host": influx_host},
                "time": iso,
                "fields": {
                    "value": temperature,
                    }
                }

            ]
    return json_body


# Defines the interval on which the capture logic
# will occur
capture_interval = 5.0 # Every 5 seconds

# InfluxDB instance
client = InfluxDBClient(influx_host, port, user, password, dbname)
client.create_database(dbname)


# Read, Report, Repeat
while 1:
    temp = instrument1.read_register(40005)
    print temp
    temperature_data = get_data_points(temp)
    client.write_points(temperature_data)
    time.sleep(capture_interval)