Small Things for Monitoring

Transcript

1. Small Things for Monitoring Jan-Piet Mens November 2016 @jpmens
2. @jpmens: consultant, part- time admin, small-scale fiddler, loves DNS, plain text, and things that work. Dreamed up OwnTracks & wrote jo
3. Today’s special MQTT
 
 ESP8266
 
 for monitoring stuff
4. MQTT is a standard, a transport, PUB/SUB messaging, designed for unreliable networks MQTT
5. security TLS authentication ACLs TLS-PSK (payload encryption)
6. Quality of Service 0 At most once 1 Assured delivery 2 Once only
7. topic names UTF-8, hierarchical, wildcards temperature/room/living devices/# finance/+/eur/rate
8. PUB/SUB cauldron
9. MQTT brokers the server bit of MQTT
10. Mosquitto C, fast, lightweight, ACLs (plugin), TLS, TLS-PSK, bridge, Websockets, logging via $SYS, FLOSS http://mosquitto.org
11. bridging
12. CLI utilities mosquitto_sub -v [-h localhost] [-p 1883] [--cafile file] [--cert file --key file] [-u username [-P password]] -t 'topic/#' subscribe publish mosquitto_pub ... [-r] -t topic -m payload
13. languages Lua, Python, C, JavaScript, Perl, Ruby, Java, ...
14. Python API: PUB #!/usr/bin/env python import paho.mqtt.publish as mqtt mqtt.single('conf/hello', 'Hello MQTT') $ mosquitto_sub -h localhost -v -t 'conf/#' conf/hello Hello MQTT payload topic
15. Python API: SUB callbacks #!/usr/bin/env python import paho.mqtt.client as paho def on_connect(mosq, userdata, rc): mqttc.subscribe("conf/+", 0) def on_message(mosq, userdata, msg): print "%s %s" % (msg.topic, str(msg.payload)) mqttc = paho.Client(userdata=None) mqttc.on_connect = on_connect mqttc.on_message = on_message mqttc.connect("localhost", 1883, 60) mqttc.loop_forever()
16. Python API: SUB $ mosquitto_pub -t 'conf/thirsty' -m 'Beertime?' $ mosquitto_pub -t 'conf/catering' -m 'Coffee is ready' $ ./sub.py conf/thirsty Beertime? conf/catering Coffee is ready
17. The hardware … EUR 22.83 Flash/RAM 16 / 64 USB 2 LAN/WAN 1 / 1 WiFi 802.11 b/g/n GL-Inet AR150
18. Small, but too much EUR 50 - 100
19. ESP8266 Low-cost micro controller full TCP/IP stack A bit like an Arduino (same IDE, or Lua) but with on-board WiFi (!) and really inexpensive Different form factors
20. ESP8266 EUR 1.50 ESP-01 EUR 2.60 NodeMCU EUR 1.50 ESP-12
21. Electrodragon EUR 5.50 http://www.electrodragon.com
22. Sonoff EUR 4.47 https://www.itead.cc/sonoff-wifi-wireless-switch.html
23. Wemos D1 mini EUR 4.00 Flash/RAM 4MB / 64 KB Voltage 3.3V Digital I/O 11 Analog 1
24. Wemos shields EUR 1.95 EUR 4.50 EUR 1.40 EUR 2.90
25. Homie-ESP8266 #include <Homie.h> HomieNode buttonNode("button", "button"); void loopHandler() { int buttonValue = debouncer.read(); /* ... */ if (Homie.setNodeProperty(buttonNode, "open", buttonValue ? "true" : "false", true)) { } } void setup() { debouncer.attach(PIN_BUTTON); Homie.setFirmware("button-homie", "1.0.0"); Homie.registerNode(buttonNode); Homie.setLoopFunction(loopHandler); Homie.setup(); } void loop() { Homie.loop(); debouncer.update(); } https://github.com/marvinroger/homie-esp8266
26. Arduino IDE
27. Le bouton devices/cea191e0/$nodes button:button devices/cea191e0/$online true devices/cea191e0/$name Le bouton devices/cea191e0/$localip 192.168.8.151 devices/cea191e0/$fwname button-homie devices/cea191e0/$fwversion 1.0.0 devices/cea191e0/$signal 100 devices/cea191e0/button/open true
28. homie-ota https://github.com/jpmens/homie-ota Retro/Vintage-style
29. Monitoring Temperature, movement (PIR), humidity, inexpensive sensors, many examples, LWT, mqttwarn for integration, Node-Red
30. alerting: mqttwarn https://github.com/jpmens/mqttwarn
31. practical solutions alerting, metering, logging, location awareness, tracking, automation, and controlling, host monitoring
32. MQTT in the wild Graylog, beaver, Ansible, RabbitMQ, collectd, openHAB, Github, Wireshark, Flukso, RemakeElectric, Jenkins, Diamond, OwnTracks
33. mqtt.org @mqttorg
34. Particle Photon EUR 19.00
35. Particle Electron EUR 70.00
36. Omega2