Monitoring my ADS-B receiver with collectd, InfluxDB, and Grafana_

#!/usr/bin/env python3
''' collectd-dump1090-fa.py (c) 2018 Matthew Ernisse <matt@going-flying.com>
 All Rights Reserved.

Collect statistics from dump1090-fa and send to collectd.  Uses the collectd
Exec plugin.

Redistribution and use in source and binary forms,
with or without modification, are permitted provided
that the following conditions are met:

    * Redistributions of source code must retain the
      above copyright notice, this list of conditions
      and the following disclaimer.
    * Redistributions in binary form must reproduce
      the above copyright notice, this list of conditions
      and the following disclaimer in the documentation
      and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
'''
import json
import os
import socket
import time

def print_aircraft(stats):
    ''' Parse and emit information from the aircraft.json file. '''
    aircraft = len(stats.get('aircraft', []))
    messages = stats.get('messages')
    if not messages:
        raise ValueError('JSON stats undefined')

    m = "PUTVAL \"{}/dump1090/counter-messages\" interval={} N:{}".format(
        hostname,
        interval,
        messages
    )
    print(m)

    m = "PUTVAL \"{}/dump1090/gauge-aircraft\" interval={} N:{}".format(
        hostname,
        interval,
        aircraft
    )
    print(m)


def print_stats(stats):
    ''' Parse and emit information from the stats.json file. '''
    counters = [
        'samples_processed',
        'samples_dropped',
    ]

    gauges = [
        'signal',
        'noise'
    ]

    values = stats.get('local')
    if not values or not type(values) == dict:
        raise ValueError('JSON stats undefined')

    for k in counters:
        value = values.get(k)
        if not value:
            value = 'U'

        m = "PUTVAL \"{}/dump1090/counter-{}\" interval={} N:{}".format(
            hostname,
            k,
            interval,
            value
        )
        print(m)

    for k in gauges:
        value = values.get(k)
        if not value:
            value = 'U'

        m = "PUTVAL \"{}/dump1090/gauge-{}\" interval={} N:{}".format(
            hostname,
            k,
            interval,
            value
        )
        print(m)


if __name__ == '__main__':
    interval = float(os.environ.get('COLLECTD_INTERVAL', 10))
    hostname = os.environ.get('COLLECTD_HOSTNAME', socket.getfqdn())

    while True:
        with open('/var/run/dump1090-fa/stats.json') as fd:
            stats = json.load(fd)

        stats = stats.get('total')
        print_stats(stats)

        with open('/var/run/dump1090-fa/aircraft.json') as fd:
            stats = json.load(fd)

        print_aircraft(stats)
        time.sleep(interval)

#!/usr/bin/env python3


import os
import socket
import time
import smbus

def read_sensor():
    ''' Protocol guide:
    https://phanderson.com/arduino/I2CCommunications.pdf
    '''
    bus = smbus.SMBus(0)
    devid = 0x27

    # writing the device id to the bus triggers a measurement request.
    bus.write_quick(devid)

    # wait for the measurement, section 3.0 says it is usually
    # 36.65mS but roll up to 50 to be sure.
    time.sleep(0.05)

    # data is 4 bytes
    data = bus.read_i2c_block_data(devid, 0)

    # bits 8,7 of the first byte received are the status bits.
    # 00 - normal
    # 01 - stale data
    # 10 - device in command mode
    # 11 - diagnostic mode [ ignore all data ]
    health = (data[0] & 0xC0) >> 6

    # section 4.0
    humidity = (((data[0] & 0x3F) << 8) + data[1]) * 100.0 / 16383.0

    # section 5.0
    tempC = ((data[2] << 6) + ((data[3] & 0xFC) >> 2)) * 165.0 / 16383.0 - 40.0

    return (tempC, humidity)


if __name__ == '__main__':
    interval = float(os.environ.get('COLLECTD_INTERVAL', 10))
    hostname = os.environ.get('COLLECTD_HOSTNAME', socket.getfqdn())

    while True:
        retval = read_sensor()
        print("PUTVAL \"{}/hih6130/gauge-temperature\" interval={} N:{:.2f}".format(
            hostname,
            interval,
            retval[0]
        ))

        print("PUTVAL \"{}/hih6130/gauge-humidity\" interval={} N:{:.2f}".format(
            hostname,
            interval,
            retval[1]
        ))

        time.sleep(interval)

LoadPlugin exec
<Plugin exec>
    Exec "nobody:nogroup" "/usr/bin/collectd-dump1090-fa.py"
    Exec "i2c:i2c" "/usr/bin/collectd-hih6130.py"
</Plugin>