hello-world

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 your local build machine is connected to, you may need to add proxy settings for Docker. See Proxy in build time.

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 and start the application

Browse to the application page of the Axis device:

http://<AXIS_DEVICE_IP>/index.html#apps

• Click on the tab Apps in the device GUI
• Enable Allow unsigned apps toggle
• Click (+ Add app) button to upload the application file
• Browse to the newly built ACAP application, depending on architecture:
  • hello_world_1_0_0_aarch64.eap
  • 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

----- Contents of SYSTEM_LOG for 'hello_world' -----

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

License

Apache License 2.0