Add documentation for setting proxy (#167)

* Add documentation for setting proxy

* Add dockumentation for setting proxy

Change-Id: I0ad7263cfc4921059dda637014308a3ba6630360

* Update for received comments

Change-Id: I309da850391a4a20e6170f2515f2f4ba6a97ce37

* wip

Change-Id: I70d9c7643f9cd042ca4579a16328abf3badbe24f

* Resolving comments

Change-Id: I61abdb32e48586dd5a4007989e4d4c85f3100443

* lint

Change-Id: I17cf6325fbfda3f9ebaf71f6b259f37535186d75

* fixed some formatting issues

* update to comments

Change-Id: I537672ab8be0eeec902a7c9a3c8212a67e370998

* Update Developer Mode doc link

Change-Id: I4d8e3939dca7a65285aca26227a25120770fc43e

---------

Co-authored-by: madelen-at-work <madelen-at-work@users.noreply.github.com>

* Update README.md

* Update README.md

---------

Co-authored-by: Stiv Abdullwahed <stiva@axis.com>
Co-authored-by: madelen-at-work <madelen-at-work@users.noreply.github.com>
Co-authored-by: Madelen Andersson <madelen.andersson@axis.com>

Author: 3 people

README.md

@@ -374,7 +374,7 @@ Make sure the application, using TLS, is running, then pull and run the
 $ docker --tlsverify --host tcp://<device-ip>:2376 pull hello-world
 Using default tag: latest
 latest: Pulling from library/hello-world
-70f5ac315c5a: Pull complete 
+70f5ac315c5a: Pull complete
 Digest: sha256:88ec0acaa3ec199d3b7eaf73588f4518c25f9d34f58ce9a0df68429c5af48e8d
 Status: Downloaded newer image for hello-world:latest
 docker.io/library/hello-world:latest
@@ -403,6 +403,32 @@ For more examples and ideas, visit:
 
 ```
 
+#### Proxy Setup
+
+If the device is located behind a proxy the Docker daemon needs to be configured.
+This is done by configuring proxy behavior for dockerd in the daemon.json file as described in
+['Configure the Docker daemon to use a proxy server'][docker-proxy].
+
+The daemon.json file should be located at `/usr/local/packages/dockerdwrapperwithcompose/localdata/daemon.json`
+on the device and should include the following properties:
+
+```json
+{
+  "proxies": {
+    "http-proxy": "http://proxy.example.com:3128",
+    "https-proxy": "https://proxy.example.com:3129",
+    "no-proxy": "*.test.example.com,.example.org,127.0.0.0/8"
+  }
+}
+```
+
+Setting the contents of the daemon.json file can be done either by adding it to the source code and
+rebuilding the application or by logging into the device over SSH with an already installed application and updating
+the file.
+In the latter case [Developer Mode][developermode] is needed, see that documentation for further details.
+Also note that, if the application is running when the file is updated, it needs to be restarted for
+the change to take effect.
+
 #### Loading images onto a device
 
 If you have images in a local repository that you want to transfer to a device, or
@@ -473,12 +499,14 @@ Take a look at the [CONTRIBUTING.md](CONTRIBUTING.md) file.
 [acap-native-container-example]: https://github.com/AxisCommunications/acap-native-sdk-examples/tree/main/container-example
 [buildx]: https://docs.docker.com/build/install-buildx/
 [devices]: https://axiscommunications.github.io/acap-documentation/docs/axis-devices-and-compatibility#sdk-and-device-compatibility
+[developermode]: http://axiscommunications.github.io/acap-documentation/docs/get-started/set-up-developer-environment/set-up-device-advanced.html#developer-mode
 [dockerDesktop]: https://docs.docker.com/desktop/
 [docker_protect-access]: https://docs.docker.com/engine/security/protect-access/
 [dockerEngine]: https://docs.docker.com/engine/
 [docker-hello-world]: https://hub.docker.com/_/hello-world
 [docker-rootless-mode]: https://docs.docker.com/engine/security/rootless/
-[latest-release]: https://github.com/AxisCommunications/docker-compose-acap/releases/latest
+[docker-proxy]: https://docs.docker.com/config/daemon/systemd/#httphttps-proxy
+[latest-release]: https://github.com/AxisCommunications/docker-acap/releases/latest
 [object-detector-python]: https://github.com/AxisCommunications/acap-computer-vision-sdk-examples/tree/main/object-detector-python
 [product-selector]: https://www.axis.com/support/tools/product-selector
 [product-selector-container]: https://www.axis.com/support/tools/product-selector/shared/%5B%7B%22index%22%3A%5B4%2C2%5D%2C%22value%22%3A%22Yes%22%7D%5D