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README.md

Copyright (C) 2021, Axis Communications AB, Lund, Sweden. All Rights Reserved.

A hello-world ACAP application using manifest

This README file explains how to build a simple Hello World manifest ACAP application. It is achieved by using the containerized API and toolchain images.

Together with this README file, you should be able to find a directory called app. That directory contains the "hello-world" application source code which can easily be compiled and run with the help of the tools and step by step below.

Getting started

These instructions will guide you on how to execute the code. Below is the structure and scripts used in the example:

hello-world
├── app
│   ├── hello_world.c
│   ├── LICENSE
│   ├── Makefile
│   └── manifest.json
├── Dockerfile
└── README.md
  • app/hello_world.c - Hello World application which writes to system-log.
  • app/LICENSE - Text file which lists all open source licensed source code distributed with the application.
  • app/Makefile - Makefile containing the build and link instructions for building the ACAP application.
  • app/manifest.json - Defines the application and its configuration.
  • Dockerfile - Docker file with the specified Axis toolchain and API container to build the example specified.
  • README.md - Step by step instructions on how to run the example.

How to run the code

Below is the step by step instructions on how to execute the program. So basically starting with the generation of the .eap file to running it on a device:

Build the application

Standing in your working directory run the following commands:

Note

Depending on the network you are connected to, you may need to add proxy settings. The file that needs these settings is: ~/.docker/config.json. For reference please see https://docs.docker.com/network/proxy and a script for Axis devices in the ACAP documentation.

docker build --tag <APP_IMAGE> .

<APP_IMAGE> is the name to tag the image with, e.g., hello_world:1.0

Default architecture is armv7hf. To build for aarch64 it's possible to update the ARCH variable in the Dockerfile or to set it in the docker build command via build argument:

docker build --build-arg ARCH=aarch64 --tag <APP_IMAGE> .

Copy the result from the container image to a local directory build:

docker cp $(docker create <APP_IMAGE>):/opt/app ./build

The working dir now contains a build folder with the following files:

hello-world
├── app
│   ├── hello_world.c
│   ├── LICENSE
│   ├── Makefile
│   └── manifest.json
├── build
│   ├── hello_world*
│   ├── hello_world_1_0_0_armv7hf.eap
│   ├── hello_world_1_0_0_LICENSE.txt
│   ├── hello_world.c
│   ├── LICENSE
│   ├── Makefile
│   ├── manifest.json
│   ├── package.conf
│   ├── package.conf.orig
│   └── param.conf
├── Dockerfile
└── README.md
  • build/hello_world* - Application executable binary file.
  • build/hello_world_1_0_0_armv7hf.eap - Application package .eap file.
  • build/hello_world_1_0_0_LICENSE.txt - Copy of LICENSE file.
  • build/manifest.json - Defines the application and its configuration.
  • build/package.conf - Defines the application and its configuration.
  • build/package.conf.orig - Defines the application and its configuration, original file.
  • build/param.conf - File containing application parameters.

Install your application

Installing your application on an Axis video device is as simple as:

Browse to the following page (replace <axis_device_ip> with the IP number of your Axis video device)

http://<axis_device_ip>/#settings/apps

Goto your device web page above > Click on the tab App in the device GUI > Add (+) sign and browse to the newly built hello_world_1_0_0_armv7hf.eap > Click Install > Run the application by enabling the Start switch

The expected output

Application log can be found directly at:

http://<axis_device_ip>/axis-cgi/admin/systemlog.cgi?appname=hello_world

or by clicking on the "App log" link in the device GUI or by extracting the logs using following commands in the terminal.

Important

> Please make sure SSH is enabled on the device to run the following commands.

tail -f /var/log/info.log | grep hello_world
----- Contents of SYSTEM_LOG for 'hello_world' -----

14:13:07.412 [ INFO ] hello_world[6425]: Hello World!

License

Apache License 2.0