210 lines
6.6 KiB
Python
Executable File
210 lines
6.6 KiB
Python
Executable File
#!/usr/bin/env python3
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"""
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=head1 NAME
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switchbotmeterbt - Munin plugin to monitor temperature/humidity with SwitchBot Meter BLE
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=head1 CONFIGURATION
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Python 3 and bluepy are necessary.
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Example for Ubuntu:
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$ sudo apt install python3-pip
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$ sudo pip3 install bluepy
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=head1 ENVIRONMENT VARIABLES
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user : root privilege is necessary for BLE scan
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env.macaddr : Mac Address(es) of SwitchBot Meter(s) separated by white-space (Required)
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env.hcidev : HCI device index. (Optional, default is 0)
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env.tempunit : Temperature unit. (Optional, default is C)
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env.scantimeout : Timeout for BLE scan. (Optional, default is 5.0 seconds)
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Example:
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[switchbotmeterbt]
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user root
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env.macaddr aa:aa:aa:aa:aa:aa bb:bb:bb:bb:bb:bb cc:cc:cc:cc:cc:cc
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=head1 NOTES
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For more details about SwitchBot Meter, see https://www.switch-bot.com/products/switchbot-meter
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=head1 AUTHOR
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K.Cima https://github.com/shakemid
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=head1 LICENSE
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GPLv2
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SPDX-License-Identifier: GPL-2.0-only
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=head1 Magic markers
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#%# family=contrib
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#%# capabilities=
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=cut
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"""
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import sys
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import os
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import subprocess
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from bluepy.btle import Scanner, DefaultDelegate
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class SwitchbotScanDelegate(DefaultDelegate):
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def __init__(self, macaddrs):
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super().__init__()
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self.sensorValues = {}
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self.macaddrs = macaddrs
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# Called when advertising data is received from an LE device
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def handleDiscovery(self, dev, isNewDev, isNewData):
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if dev.addr in self.macaddrs:
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for (adtype, desc, value) in dev.getScanData():
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if desc == '16b Service Data':
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munin_debug(value)
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self._decodeSensorData(dev, value)
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def _decodeSensorData(self, dev, value):
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# Extract lower 6 octets
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valueBinary = bytes.fromhex(value[4:16])
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# Refer to Meter BLE open API
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# https://github.com/OpenWonderLabs/python-host/wiki/Meter-BLE-open-API
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deviceType = chr(valueBinary[0] & 0b01111111)
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battery = valueBinary[2] & 0b01111111
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tint = valueBinary[4] & 0b01111111
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tdec = valueBinary[3] & 0b00001111
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temperature = tint + tdec / 10
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isTemperatureAboveFreezing = valueBinary[4] & 0b10000000
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if not isTemperatureAboveFreezing:
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temperature = -temperature
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humidity = valueBinary[5] & 0b01111111
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self.sensorValues[dev.addr] = {
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'DeviceType': deviceType,
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'Temperature': temperature,
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'Humidity': humidity,
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'Battery': battery,
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'RSSI': dev.rssi
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}
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munin_debug(str(self.sensorValues))
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class SwitchbotMeterPlugin():
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def __init__(self):
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self.params = {}
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self.params['pluginname'] = os.path.basename(__file__)
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self.params['macaddrs'] = [str.lower(macaddr)
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for macaddr in os.getenv('macaddr').split()]
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self.params['hcidev'] = int(os.getenv('hcidev', 0))
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self.params['tempunit'] = os.getenv('tempunit', 'C')
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self.params['scantimeout'] = float(os.getenv('scantimeout', 5.0))
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self.graphs = {
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'temp': {
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'name': 'Temperature',
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'attrs': [
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'graph_title SwitchBot Meter Temperature',
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'graph_category sensors',
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'graph_vlabel Temp ' + self.params['tempunit'],
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'graph_scale no',
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'graph_args --base 1000'
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]
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},
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'humid': {
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'name': 'Humidity',
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'attrs': [
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'graph_title SwitchBot Meter Humidity',
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'graph_category sensors',
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'graph_vlabel Humid %',
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'graph_scale no',
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'graph_args --base 1000'
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]
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},
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'batt': {
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'name': 'Battery',
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'attrs': [
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'graph_title SwitchBot Meter Battery',
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'graph_category sensors',
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'graph_vlabel %',
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'graph_scale no',
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'graph_args --base 1000 --lower-limit 0 --upper-limit 100'
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]
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},
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'rssi': {
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'name': 'RSSI',
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'attrs': [
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'graph_title SwitchBot Meter RSSI',
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'graph_category sensors',
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'graph_vlabel dB',
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'graph_scale no',
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'graph_args --base 1000'
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]
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}
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}
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def config(self):
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# print config
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for k in self.graphs.keys():
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print('multigraph ' + self.params['pluginname'] + '_' + k)
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for line in self.graphs[k]['attrs']:
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print(line)
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for macaddr in self.params['macaddrs']:
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field = macaddr.replace(':', '')
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print(field + '.label ' + macaddr)
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def fetch(self):
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# scan to fetch data
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scanner = Scanner(self.params['hcidev']).withDelegate(SwitchbotScanDelegate(self.params['macaddrs']))
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try:
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# sometimes it might fail
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scanner.scan(self.params['scantimeout'])
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for macaddr in self.params['macaddrs']:
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check = scanner.delegate.sensorValues[macaddr]
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except KeyError as e:
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munin_error('retry scan for exception: ' + str(type(e)))
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scanner.scan(self.params['scantimeout'])
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except Exception as e:
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munin_error('reset hci and retry scan for exception: ' + str(type(e)))
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subprocess.call(f'hciconfig hci{self.params["hcidev"]} down && hciconfig hci{self.params["hcidev"]} up', shell=True)
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scanner.scan(self.params['scantimeout'])
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# print value
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for k in self.graphs.keys():
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print('multigraph ' + self.params['pluginname'] + '_' + k)
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for macaddr in self.params['macaddrs']:
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field = macaddr.replace(':', '')
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try:
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print(field + '.value ' +
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str(scanner.delegate.sensorValues[macaddr][self.graphs[k]['name']]))
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except KeyError:
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pass
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def munin_error(message):
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print(message, file=sys.stderr)
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def munin_debug(message):
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if os.getenv('MUNIN_DEBUG') == '1':
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print('# ' + message)
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def main():
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plugin = SwitchbotMeterPlugin()
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if len(sys.argv) > 1 and sys.argv[1] == 'config':
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plugin.config()
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if os.getenv('MUNIN_CAP_DIRTYCONFIG') == '1':
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plugin.fetch()
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else:
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plugin.fetch()
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if __name__ == '__main__':
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main()
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