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Container for SNA-LGTC that pushes temperature measurements to Videk

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Temperature monitor for SNA-LGTC

This is a small containerized application for SNA-LGTC. It reads a SHT21 sensor once per minute and pushes the temperature and relative humidity measurements to the Videk management system.

It should be possible to build and run this container on both a PC and the SNA-LGTC host board from the same Dockerfile. When running on a PC, the VESNA SNC board should be connected over the Olimex ARM-USB-OCD programmer (both JTAG and the serial line). When running on the SNA-LGTC host board there should be a VESNA SNC guest board attached.

In both cases VESNA SNC board must be equipped with a SNE-SENS board with a SHT21 sensor (there is also a fake-sensor branch available that works without the SNE-SENS board).

This application has two components:

  • Firmware for SNC uses the vesna-drivers library to actually talk with the SHT21 sensor over the I2C bus. It exposes the sensor measurements on the serial line using the ALH protocol. The firmware is built at the same time as the container image and uploaded to the SNC board when the container is started.

  • A Python script running on the Linux system on the SNA-LGTC board. This script polls the sensor over the serial line and pushes the measurements to the Videk system. It registers the SHT21 sensor to Videk as necessary. The cluster and sensor node should already be registered as part of the SNA-LGTC boot process.

See also:

Building the container

To build the container image, run the following command on the SNA-LGTC board.

Note: building the container requires cloning of the private vesna-drivers GitHub repository. Because of this, you need a GitHub deploy key. This key is present on SNA-LGTC boards in /etc/videk/id_rsa_github.

Copy the id_rsa_github file into the top directory of this repository before building the container. Do not commit this file to the git repository.

Do not push the resulting container to Docker Hub or any other public repository.

$ docker build -t logatec-temp-monitor .

To run the container in background:

$ docker run -d --privileged -v /etc/videk/api.key:/etc/videk/api.key -v /etc/hostname:/etc/videk/hostname logatec-temp-monitor

It is possible to leave out the Videk configurations (-v options). In that case, measurements will not be pushed to Videk.

There is an automated deployment system which depends on Github release feature. There are two additional scripts needed for this first the ansible script deploy.yml for deployment on nodes and second a small Makefile to tell the build system where to start.

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