Added AFB Helper Guide in Developer Guides

Revised and added AFB Helper Guide as a part of Developer Guides.

Bug-AGL: [SPEC-3633]

Signed-off-by: Shankho Boron Ghosh <shankhoghosh123@gmail.com>
Change-Id: I3df9265ae0570e987d80bc4bd2d3d14e7743b26a
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/documentation/+/25665
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/docs/3_Developer_Guides/4_AFB_Helper_Guide/6_Qt_AFB_Websocket_client.md b/docs/3_Developer_Guides/4_AFB_Helper_Guide/6_Qt_AFB_Websocket_client.md
new file mode 100644
index 0000000..5572548
--- /dev/null
+++ b/docs/3_Developer_Guides/4_AFB_Helper_Guide/6_Qt_AFB_Websocket_client.md
@@ -0,0 +1,41 @@
+---
+title: Qt AFB Websocket client
+---
+
+## QAfbWebsocketClient(QObject* parent = nullptr)
+
+Default constructor.
+
+* `parent`: Parent object.
+
+## QAbstractSocket::SocketError error()
+
+Get and return the last error code.
+
+## QString errorString()
+
+Get and return the last error as a string.
+
+## bool isValid()
+
+Check if connection is ready or not.
+
+Returns `true` if the connected is ready to read and write, `false` otherwise.
+
+## void call(const QString& api, const QString& verb, const QJsonValue& arg = QJsonValue(), closure_t closure = nullptr)
+
+Call an api's verb with an argument.
+
+* `api`: Api to call.
+* `verb`: Verb to call.
+* `arg`: Argument to pass.
+* `closure`: callback function to call at the verb reply
+
+## void QAfbWebsocketClient::sendTextMessage(QString msg)
+
+Send a text message over the websocket.
+
+This is use for test only, you should not use this method because it sent text
+**as-is**, so you have to follow the binder's protocol by your self.
+
+* `msg`: Message to send.
\ No newline at end of file