Added a new guide explaing how to get E2a dataflow

CHANGELOG.md

@@ -3,6 +3,10 @@
 All notable changes to this project will be documented in this file.  
 Changes before version 3.1.0 is not included
 
+## [latest commits]
+
+- Added a new guide explaing how to get E2a dataflow
+
 ## [3.1.2] - 2024-09-26
 
 - Added variable for container name in docker-compose file

guides/dataflow_e2a.md

+# Dataflow E2a
+
+Use this endpoint to create the xml E2a dataflow.  
+This also allows EEA to retrieve data directly if needed
+
+## Group & User
+
+Before retrieving the data you need to create a user with the necessary rights.  
+In the Raven web site create a new Group with `EEA dataflow` and `All networks` enabled.  
+Next, create a User with the new Group.
+
+## Token
+
+To get the token make a call to the authentication endpoint with the new users credentials
+
+```yaml
+POST api/auth/signin
+BODY {"username":"username", "password":"password"}
+```
+
+## E2a
+
+Make a call to the E2a endpoint to get the xml.  
+Remember to include the token received earlier.  
+`last_request` is a datetime format that gives you all changes since your last request.  
+It will typically be **_now() - 1 hours_**
+
+```yaml
+GET api/dataflow/e2a?last_request=<DATETIME>
+Authorization: Bearer <MY_TOKEN>
+```
+
+## E2a without authentication
+
+It is possible to get E2a data without using a token, but this require the installation of `raven-public-api` and setting the .env variable `INCLUDE_EEA = True`  
+See https://git.nilu.no/raven/raven-public-api#eeae2a