Internet of Things

aka IoT

I have two raspberry pis that i'd like to wire up using AWS IoT

AWS Iot Notes

AWS Setup Notes

http://docs.aws.amazon.com/iot/latest/developerguide/policy-actions.html

aws iot list-policy-principals --policy-name mypolicy
aws iot list-principal-policies --principal ??
aws iot list-principal-things --principal ??
aws iot list-thing-principals --thing-name mypi1

principal means certificate.

THINGS <-> PRINCIPAL ( cert ) <-> POLICY

best guid so far:

https://www.hackster.io/mariocannistra/python-and-paho-for-mqtt-with-aws-iot-921e41

Script service setup

from: http://www.diegoacuna.me/how-to-run-a-script-as-a-service-in-raspberry-pi-raspbian-jessie/

/lib/systemd/system/awsiotpub_temp.service

[Unit]
Description=IoT AWS Sensor Publisher
After=multi-user.target

[Service]
Type=simple
ExecStart=/usr/bin/python /home/pi/python-paho-mqtt-for-aws-iot/awsiotpub_temp.py
Restart=on-abort

[Install]
WantedBy=multi-user.target

enable:

sudo chmod 644 /lib/systemd/system/hello.service
chmod +x /home/pi/hello_world.py
sudo systemctl daemon-reload
sudo systemctl enable hello.service
sudo systemctl start hello.service

on creating rules with variable substitution

for example if you want to post data from device X to an elasticsearch index with id X

you should generate a new uuid id for each reading:

"id": "${newuuid()}"

Guides

https://dzone.com/refcardz/getting-started-with-mqtt

What is mqtt?

https://www.hackster.io/mariocannistra/python-and-paho-for-mqtt-with-aws-iot-921e41

I like this guide because it gives an example subscriber and an example publisher.

References

MQ Best practices http://www.hivemq.com/blog/mqtt-essentials-part-5-mqtt-topics-best-practices