in_someip: Initial input plugin documentation.

Adds the documentation for the new in_someip plugin:
  fluent/fluent-bit#9570

Signed-off-by: Anthony Payne <[email protected]>

Author: anthonypayne-GM

pipeline/inputs/someip.md

@@ -0,0 +1,100 @@
+# SOMEIP
+
+The **someip** input plugin is used to interact with a SOME/IP communication network to subscribe to events and to exchange request/response with SOME/IP services.
+
+This plugin uses the [vsomeip library](https://github.com/COVESA/vsomeip) \(built-in dependency\).
+
+## Configuration Parameters
+
+The plugin supports the following configuration parameters:
+
+| Key          | Description |
+| ------------ | ----------- |
+| Event        | SOME/IP event to subscribe to. The configuration can have multiple events, one on each line. An event is identified by a comma separated list with, "_service ID_, _event ID_, _event group ID 1_, _event group ID 2_, ...". The Event must include at least one _event group ID_, but can be associated with multiple. |
+| RPC          | SOME/IP request to send when service is available. The configuration can have multiple RPCs, one on each line. An RPC is composed as a comma separated list with, "_service ID_, _service instance_, _method ID_, _request payload_". The request payload should be a should be base64 encoded |
+
+## Getting Started
+
+In order to subscribe to SOME/IP events or send request/receive SOME/IP response, you can run the plugin from the command line or through the configuration file:
+
+### Command Line
+
+The **someip** plugin can be enabled with options from the command line:
+
+```bash
+$ ./fluent-bit -i someip -p Event=4,1,32768,1 -o stdout
+```
+
+### Configuration File
+
+In your main configuration file append the following _Input_ & _Output_ sections:
+
+```text
+[INPUT]
+    Name someip
+    Tag  in.someip
+
+    Event 4,1,32768,1
+    Event 4,1,32769,2
+    RPC   4,1,1,CgAQAw==
+
+[OUTPUT]
+    Name        stdout
+```
+
+## Testing
+
+Once Fluent Bit is running, you can send some SOME/IP messages using the SOME/IP test service provided.
+
+```bash
+$ bin/someip_test_service 
+2025-02-06 22:18:06.211337  [info] Parsed vsomeip configuration in 0ms
+...
+Sending event with message Event Number 1
+Sent notification for service 4, event 32768
+Sending event with message Event Number 2
+Sent notification for service 4, event 32768
+```
+
+In [Fluent Bit](http://fluentbit.io) we should see the following output:
+
+```bash
+$ bin/fluent-bit -i someip -p Event=4,1,32768,1 -o stdout
+Fluent Bit v3.2.0
+* Copyright (C) 2015-2024 The Fluent Bit Authors
+* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
+* https://fluentbit.io
+
+______ _                  _    ______ _ _           _____  _____ 
+|  ___| |                | |   | ___ (_) |         |____ |/ __  \
+| |_  | |_   _  ___ _ __ | |_  | |_/ /_| |_  __   __   / /`' / /'
+|  _| | | | | |/ _ \ '_ \| __| | ___ \ | __| \ \ / /   \ \  / /  
+| |   | | |_| |  __/ | | | |_  | |_/ / | |_   \ V /.___/ /./ /___
+\_|   |_|\__,_|\___|_| |_|\__| \____/|_|\__|   \_/ \____(_)_____/
+
+
+[2025/02/06 22:12:23] [ info] [fluent bit] version=3.2.0, commit=239b46be20, pid=51044
+[2025/02/06 22:12:23] [ info] [storage] ver=1.5.2, type=memory, sync=normal, checksum=off, max_chunks_up=128
+[2025/02/06 22:12:23] [ info] [simd    ] disabled
+[2025/02/06 22:12:23] [ info] [cmetrics] version=0.9.8
+[2025/02/06 22:12:23] [ info] [ctraces ] version=0.5.7
+[2025/02/06 22:12:23] [ info] [input:someip:someip.0] initializing
+[2025/02/06 22:12:23] [ info] [input:someip:someip.0] storage_strategy='memory' (memory only)
+[2025/02/06 22:12:23] [ info] [input:someip:someip.0] Received 1 configured events
+[2025/02/06 22:12:23] [ info] [input:someip:someip.0] No RPC configured.
+...
+2025-02-06 22:18:03.130557  [info] vSomeIP 3.5.1 | (default)
+2025-02-06 22:18:06.223714  [info] Application/Client 0101 is registering.
+2025-02-06 22:18:06.225581  [info] Client [100] is connecting to [101] at /tmp/vsomeip-101 endpoint > 0x79a50c000e30
+2025-02-06 22:18:06.230477  [info] REGISTERED_ACK(0101)
+2025-02-06 22:18:06.236103  [info] Port configuration missing for [4.1]. Service is internal.
+2025-02-06 22:18:06.236923  [info] OFFER(0101): [0004.0001:0.0] (true)
+2025-02-06 22:18:06.240237  [info] SUBSCRIBE ACK(0101): [0004.0001.0001.ffff]
+Received message for service 4 event = 32768
+[0] someip.0: [[1738880288.622425534, {}], {"record type"=>"event", "service"=>4, "instance"=>1, "event"=>32768, "payload"=>"RXZlbnQgTnVtYmVyIDE="}]
+Received message for service 4 event = 32768
+[0] someip.0: [[1738880290.622781511, {}], {"record type"=>"event", "service"=>4, "instance"=>1, "event"=>32768, "payload"=>"RXZlbnQgTnVtYmVyIDI="}]
+...
+```
+
+