Added SDK & Service guides

Revised Developer Guides with tutorials on installing the SDK and
creating a new service from scratch.

v2 : Removed trailing whitespaces.

v3 : Removed duplicated output.

Bug-AGL: [SPEC-3633]

Signed-off-by: Shankho Boron Ghosh <shankhoghosh123@gmail.com>
Change-Id: I5a1854f54f476ac69498956e4dd22fa4b6e85eee

2 files changed, 523 insertions, 0 deletions

diff --git a/docs/3_Developer_Guides/1_Setting_Up_AGL_SDK.md b/docs/3_Developer_Guides/1_Setting_Up_AGL_SDK.md
new file mode 100644
index 0000000..c4ea431
--- /dev/null
+++ b/docs/3_Developer_Guides/1_Setting_Up_AGL_SDK.md
@@ -0,0 +1,52 @@
+---
+title: Setting Up AGL SDK
+---
+
+AGL provides a pre-built ready-made Software Development Kit (SDK) to help
+quickstart the service and application development process.
+
+1. Download the prebuilt SDK :
+
+      - **x86** : [qemux86-64](https://download.automotivelinux.org/AGL/snapshots/master/latest/qemux86-64/deploy/sdk/poky-agl-glibc-x86_64-agl-demo-platform-crosssdk-corei7-64-qemux86-64-toolchain-10.90.0+snapshot.sh)
+
+      - **ARM 32 bit** : [qemuarm](https://download.automotivelinux.org/AGL/snapshots/master/latest/qemuarm/deploy/sdk/poky-agl-glibc-x86_64-agl-demo-platform-crosssdk-armv7vet2hf-neon-vfpv4-qemuarm-toolchain-10.90.0+snapshot.sh)
+
+      - **AARCH64 - ARM 64bit** : [qemuarm64](https://download.automotivelinux.org/AGL/snapshots/master/latest/qemuarm64/deploy/sdk/poky-agl-glibc-x86_64-agl-demo-platform-crosssdk-aarch64-qemuarm64-toolchain-10.90.0+snapshot.sh)
+
+        *Henceforth,* **qemux86-64** *is used in these guides, unless specified
+        otherwise.*
+
+2. Create application developmment directory and copy SDK into them :
+
+    ```sh
+    $ mkdir ~/agl-app
+    $ cp ~/Downloads/poky-agl-glibc-x86_64-agl-demo-platform-crosssdk-corei7-64-qemux86-64-toolchain-10.90.0+snapshot.sh ~/agl-app/
+    $ cd ~/agl-app
+    ```
+
+3. Install the downloaded SDK :
+
+    ```sh
+    $ chmod 777 poky-agl-glibc-x86_64-agl-demo-platform-crosssdk-corei7-64-qemux86-64-toolchain-10.90.0+snapshot.sh
+    $ mkdir agl-sdk/
+    $ ./poky-agl-glibc-x86_64-agl-demo-platform-crosssdk-corei7-64-qemux86-64-toolchain-10.90.0+snapshot.sh
+    ```
+    Select target directory for SDK : `~/agl-app/agl-sdk`
+
+    ```sh
+    Automotive Grade Linux SDK installer version 10.90.0+snapshot
+    =============================================================
+    Enter target directory for SDK (default: /opt/agl-sdk/10.90.0+snapshot-corei7-64): ~/agl-app/agl-sdk
+    You are about to install the SDK to "/home/boron/agl-app/agl-sdk". Proceed [Y/n]? Y
+    Extracting SDK..........................................................................................................................................done
+    Setting it up...done
+    SDK has been successfully set up and is ready to be used.
+    Each time you wish to use the SDK in a new shell session, you need to source the environment setup script e.g.
+    $ . /home/boron/agl-app/agl-sdk/environment-setup-corei7-64-agl-linux
+    ```
+
+4. Source the SDK environment setup, each time you wish to use the SDK in a new shell session :
+
+    ```sh
+    $ source ~/agl-app/agl-sdk/environment-setup-corei7-64-agl-linux
+    ```
\ No newline at end of file
diff --git a/docs/3_Developer_Guides/2_Creating_a_New_Service.md b/docs/3_Developer_Guides/2_Creating_a_New_Service.md
new file mode 100644
index 0000000..bbaa609
--- /dev/null
+++ b/docs/3_Developer_Guides/2_Creating_a_New_Service.md
@@ -0,0 +1,471 @@
+---
+title: Creating a New Service
+---
+
+This tutorial provides instructions on **Creating a New Service** from scratch.
+
+### 1. Create new project development directory
+
+   ```sh
+   $ cd ~/agl-app
+   $ mkdir newservice/
+   $ cd newservice/
+   ```
+
+### 2. Source the SDK environment setup
+
+  ```sh
+  $ source ~/agl-app/agl-sdk/environment-setup-corei7-64-agl-linux
+  ```
+
+### 3. Copy initial CMAKE configuration templates
+
+  ```sh
+  $ mkdir -p conf.d/cmake
+  $ cp ${OECORE_NATIVE_SYSROOT}/usr/share/doc/CMakeAfbTemplates/samples.d/config.cmake.sample conf.d/cmake/config.cmake
+  $ cp ${OECORE_NATIVE_SYSROOT}/usr/share/doc/CMakeAfbTemplates/samples.d/CMakeLists.txt.sample CMakeLists.txt
+  ```
+
+### 4. Edit CMAKE configuration template
+
+  ```sh
+  $ vim ~/agl-app/newservice/conf.d/cmake/config.cmake
+
+    ###########################################################################
+    # Copyright 2020 # INSERT YEAR
+    #
+    # author: John Doe <john.doe@example.com> # INSERT AUTHOR DETAILS
+    #
+    # Licensed under the Apache License, Version 2.0 (the "License");
+    # you may not use this file except in compliance with the License.
+    # You may obtain a copy of the License at
+    #
+    #     http://www.apache.org/licenses/LICENSE-2.0
+    #
+    # Unless required by applicable law or agreed to in writing, software
+    # distributed under the License is distributed on an "AS IS" BASIS,
+    # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    # See the License for the specific language governing permissions and
+    # limitations under the License.
+    ###########################################################################
+
+    # Project Info
+    # ------------------
+    set(PROJECT_NAME hellocount)    # INSERT NEW PROJECT NAME
+    set(API_NAME hellocount)    #INSERT NEW API NAME
+    set(PROJECT_PRETTY_NAME "Example")
+    set(PROJECT_DESCRIPTION "AGL hellocount application example")   # INSERT CONCISE PROJECT DESCRIPTION
+    set(PROJECT_URL "https://gerrit.automotivelinux.org/gerrit/apps/cmake-apps-module")
+    set(PROJECT_ICON "icon.png")
+    set(PROJECT_AUTHOR "John Doe")    # INSERT AUTHOR NAME
+    set(PROJECT_AUTHOR_MAIL "john.doe@example.com")   # INSERT AUTHOR EMAIL
+    set(PROJECT_LICENSE "APL2.0")
+    set(PROJECT_LANGUAGES "C")
+    set(PROJECT_VERSION "1.0.0")    # INSERT PROJECT VERSION
+
+    # Which directories inspect to find CMakeLists.txt target files
+    # set(PROJECT_SRC_DIR_PATTERN "*")
+
+    # Where are stored the project configuration files
+    # relative to the root project directory
+    set(PROJECT_CMAKE_CONF_DIR "conf.d")
+
+    # Compilation Mode (DEBUG, RELEASE, COVERAGE or PROFILING)
+    # ----------------------------------
+    set(BUILD_TYPE "RELEASE") # SELECT BUILD TYPE
+    #set(USE_EFENCE 1)
+
+    # Kernel selection if needed. You can choose between a
+    # mandatory version to impose a minimal version.
+    # Or check Kernel minimal version and just print a Warning
+    # about missing features and define a preprocessor variable
+    # to be used as preprocessor condition in code to disable
+    # incompatibles features. Preprocessor define is named
+    # KERNEL_MINIMAL_VERSION_OK.
+    #
+    # NOTE*** FOR NOW IT CHECKS KERNEL Yocto environment and
+    # Yocto SDK Kernel version.
+    # -----------------------------------------------
+    #set (kernel_mandatory_version 4.8)
+    #set (kernel_minimal_version 4.8)
+
+    # Compiler selection if needed. Impose a minimal version.
+    # -----------------------------------------------
+    set (gcc_minimal_version 4.9)
+
+    # PKG_CONFIG required packages
+    # -----------------------------
+    set (PKG_REQUIRED_LIST
+      json-c
+      afb-daemon
+    )
+
+    # You can also consider to include libsystemd
+    # -----------------------------------
+    #list (APPEND PKG_REQUIRED_LIST libsystemd>=222)
+
+    # Prefix path where will be installed the files
+    # Default: /usr/local (need root permission to write in)
+    # ------------------------------------------------------
+    #set(INSTALL_PREFIX /opt/AGL CACHE PATH "INSTALL PREFIX PATH")
+
+    # Customize link option
+    # -----------------------------
+    #list(APPEND link_libraries -an-option)
+
+    # Compilation options definition
+    # Use CMake generator expressions to specify only for a specific language
+    # Values are prefilled with default options that is currently used.
+    # Either separate options with ";", or each options must be quoted separately
+    # DO NOT PUT ALL OPTION QUOTED AT ONCE , COMPILATION COULD FAILED !
+    # ----------------------------------------------------------------------------
+    #set(COMPILE_OPTIONS
+    # -Wall
+    # -Wextra
+    # -Wconversion
+    # -Wno-unused-parameter
+    # -Wno-sign-compare
+    # -Wno-sign-conversion
+    # -Werror=maybe-uninitialized
+    # -Werror=implicit-function-declaration
+    # -ffunction-sections
+    # -fdata-sections
+    # -fPIC
+    # CACHE STRING "Compilation flags")
+    #set(C_COMPILE_OPTIONS "" CACHE STRING "Compilation flags for C language.")
+    #set(CXX_COMPILE_OPTIONS "" CACHE STRING "Compilation flags for C++ language.")
+    #set(PROFILING_COMPILE_OPTIONS
+    # -g
+    # -O0
+    # -pg
+    # -Wp,-U_FORTIFY_SOURCE
+    # CACHE STRING "Compilation flags for PROFILING build type.")
+    #set(DEBUG_COMPILE_OPTIONS
+    # -g
+    # -ggdb
+    # CACHE STRING "Compilation flags for DEBUG build type.")
+    #set(COVERAGE_COMPILE_OPTIONS
+    # -g
+    # -O0
+    # --coverage
+    # CACHE STRING "Compilation flags for COVERAGE build type.")
+    #set(RELEASE_COMPILE_OPTIONS
+    # -O2
+    # -pipe
+    # -D_FORTIFY_SOURCE=2
+    # -fstack-protector-strong
+    # -Wformat -Wformat-security
+    # -Werror=format-security
+    # -feliminate-unused-debug-types
+    # -Wl,-O1
+    # -Wl,--hash-style=gnu
+    # -Wl,--as-needed
+    # -fstack-protector-strong
+    # -Wl,-z,relro,-z,now
+    # CACHE STRING "Compilation flags for RELEASE build type.")
+
+    # Location for config.xml.in template file.
+    #
+    # If you keep them commented then it will build with a default minimal widget
+    # template which is very simple and it is highly probable that it will not suit
+    # to your app.
+    # -----------------------------------------
+    #set(WIDGET_ICON "conf.d/wgt/${PROJECT_ICON}" CACHE PATH "Path to the widget icon")
+    set(WIDGET_CONFIG_TEMPLATE "${CMAKE_CURRENT_SOURCE_DIR}/conf.d/wgt/config.xml.in" CACHE PATH "Path to widget config file template (config.xml.in)")   # UNCOMMENT WIDGET_CONFIG_TEMPLATE
+    #set(TEST_WIDGET_CONFIG_TEMPLATE "${CMAKE_CURRENT_SOURCE_DIR}/conf.d/wgt/test-config.xml.in" CACHE PATH "Path to the test widget config file template (test-config.xml.in)")
+
+    # Mandatory widget Mimetype specification of the main unit
+    # --------------------------------------------------------------------------
+    # Choose between :
+    #- text/html : HTML application,
+    #	content.src designates the home page of the application
+    #
+    #- application/vnd.agl.native : AGL compatible native,
+    #	content.src designates the relative path of the binary.
+    #
+    # - application/vnd.agl.service: AGL service, content.src is not used.
+    #
+    #- ***application/x-executable***: Native application,
+    #	content.src designates the relative path of the binary.
+    #	For such application, only security setup is made.
+    #
+    set(WIDGET_TYPE application/vnd.agl.service)    # UNCOMMENT WIDGET_TYPE
+
+    # Mandatory Widget entry point file of the main unit
+    # --------------------------------------------------------------
+    # This is the file that will be executed, loaded,
+    # at launch time by the application framework.
+    #
+    set(WIDGET_ENTRY_POINT lib/libhellocount.so)    # UNCOMMENT WIDGET_ENTRY_POINT
+
+    # Optional dependencies order
+    # ---------------------------
+    #set(EXTRA_DEPENDENCIES_ORDER)
+
+    # Optional Extra global include path
+    # -----------------------------------
+    #set(EXTRA_INCLUDE_DIRS)
+
+    # Optional extra libraries
+    # -------------------------
+    #set(EXTRA_LINK_LIBRARIES)
+
+    # Optional force binding Linking flag
+    # ------------------------------------
+    # set(BINDINGS_LINK_FLAG LinkOptions )
+
+    # Optional force package prefix generation, like widget
+    # -----------------------------------------------------
+    # set(PKG_PREFIX DestinationPath)
+
+    # Optional Application Framework security token
+    # and port use for remote debugging.
+    #------------------------------------------------------------
+    #set(AFB_TOKEN   ""     CACHE PATH "Default binder security token")   # COMMENT AFB_TOKEN
+    #set(AFB_REMPORT "1234" CACHE PATH "Default binder listening port")   # COMMENT AFB_REMPORT
+
+    # Print a helper message when every thing is finished
+    # ----------------------------------------------------
+    set(CLOSING_MESSAGE "Typical binding launch: cd ${CMAKE_BINARY_DIR}/package \\&\\& afb-daemon --port=${AFB_REMPORT} --workdir=. --ldpaths=lib --roothttp=htdocs  --token=\"${AFB_TOKEN}\" --tracereq=common --verbose")
+    set(PACKAGE_MESSAGE "Install widget file using in the target : afm-util install ${PROJECT_NAME}.wgt")
+
+    # Optional schema validator about now only XML, LUA and JSON
+    # are supported
+    #------------------------------------------------------------
+    #set(LUA_CHECKER "luac" "-p" CACHE STRING "LUA compiler")
+    #set(XML_CHECKER "xmllint" CACHE STRING "XML linter")
+    #set(JSON_CHECKER "json_verify" CACHE STRING "JSON linter")
+
+    include(CMakeAfbTemplates)
+  ```
+
+### 5. Copy WGT configuration template
+
+  ```sh
+  $ mkdir -p conf.d/wgt
+  $ cp ${OECORE_NATIVE_SYSROOT}/usr/share/doc/CMakeAfbTemplates/samples.d/config.xml.in.sample conf.d/wgt/config.xml.in
+  ```
+
+### 6. Run CMAKE and Generate autobuild
+
+  ```sh
+  $ mkdir build/
+  $ cd build/
+  $ cmake ..
+  $ make autobuild
+  ```
+
+### 7. Create service directory
+
+  ```sh
+  $ cd ..
+  $ mkdir service/
+  $ cd service/
+  ```
+  This `service` directory holds the C code & CMakeLists.txt ;
+
+  - Add `hellocount-service.c` file which contains the functional C code :
+
+    ```sh
+    $ vim hellocount-service.c
+
+      /*
+       * Copyright 2020 The Linux Foundation # INSERT YEAR & ORG
+       *
+       * Licensed under the Apache License, Version 2.0 (the "License");
+       * you may not use this file except in compliance with the License.
+       * You may obtain a copy of the License at
+       *
+       *   http://www.apache.org/licenses/LICENSE-2.0
+       *
+       * Unless required by applicable law or agreed to in writing, software
+       * distributed under the License is distributed on an "AS IS" BASIS,
+       * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+       * See the License for the specific language governing permissions and
+       * limitations under the License.
+       */
+
+      #define _GNU_SOURCE
+      #include <stdio.h>
+      #include <string.h>
+      #include <json-c/json.h>
+
+      #define AFB_BINDING_VERSION 3
+      #include <afb/afb-binding.h>
+
+      static void pingSample(afb_req_t request)
+      {
+        static int pingcount = 0;
+
+        afb_req_success_f(request, json_object_new_int(pingcount), "Ping count = %d", pingcount);
+
+        AFB_API_NOTICE(afbBindingV3root, "Verbosity macro at level notice invoked at ping invocation count = %d", pingcount);
+
+        pingcount++;
+      }
+
+      static void count(afb_req_t request)
+      {
+        static int counter = 0;
+
+        afb_req_success_f(request, json_object_new_int(counter), "Counter = %d", counter);
+
+        AFB_API_NOTICE(afbBindingV3root, "Verbosity macro at level notice invoked at count invocation count = %d", counter);
+
+        counter++;
+      }
+
+
+
+      static const afb_verb_t verbs[] =
+      {
+        /*Without security*/
+        {.verb = "ping", .session = AFB_SESSION_NONE, .callback = pingSample, .auth = NULL},
+        {.verb = "count", .session = AFB_SESSION_NONE, .callback = count, .auth = NULL},
+        {NULL}
+      };
+
+      const afb_binding_t afbBindingExport =
+      {
+        .api = "count",
+        .specification = "HelloCount API",
+        .verbs = verbs,
+        .preinit = NULL,
+        .init = NULL,
+        .onevent = NULL,
+        .userdata = NULL,
+        .provide_class = NULL,
+        .require_class = NULL,
+        .require_api = NULL,
+        .noconcurrency = 0
+      };
+    ```
+
+- Add `CMakeLists.txt` file :
+
+    ```sh
+    $ vim CMakeLists.txt
+
+      ###########################################################################
+      # Copyright 2020 The Linux Foundation # INSERT YEAR & ORG
+      #
+      # Licensed under the Apache License, Version 2.0 (the "License");
+      # you may not use this file except in compliance with the License.
+      # You may obtain a copy of the License at
+      #
+      #     http://www.apache.org/licenses/LICENSE-2.0
+      #
+      # Unless required by applicable law or agreed to in writing, software
+      # distributed under the License is distributed on an "AS IS" BASIS,
+      # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+      # See the License for the specific language governing permissions and
+      # limitations under the License.
+      ###########################################################################
+
+      # Add target to project dependency list
+      PROJECT_TARGET_ADD(hellocount)
+          # Define project Targets
+          ADD_LIBRARY(${TARGET_NAME} MODULE hellocount-service.c)
+
+          # Binder exposes a unique public entry point
+          SET_TARGET_PROPERTIES(${TARGET_NAME} PROPERTIES
+          PREFIX "afb-"
+          LABELS "BINDING"
+          OUTPUT_NAME ${TARGET_NAME}
+          )
+    ```
+
+### 8. Build and Package `wgt` using autobuild
+
+  ```sh
+  $ cd ..
+
+  $ ./autobuild/agl/autobuild build
+
+    make[1]: Entering directory '/home/boron/agl-app/newservice/build'
+    make[2]: Entering directory '/home/boron/agl-app/newservice/build'
+    make[3]: Entering directory '/home/boron/agl-app/newservice/build'
+    make[3]: Leaving directory '/home/boron/agl-app/newservice/build'
+    [100%] Built target autobuild
+    make[2]: Leaving directory '/home/boron/agl-app/newservice/build'
+    make[1]: Leaving directory '/home/boron/agl-app/newservice/build'
+
+  $ ./autobuild/agl/autobuild package
+
+    make[1]: Entering directory '/home/boron/agl-app/newservice/build'
+    make[2]: Entering directory '/home/boron/agl-app/newservice/build'
+    make[3]: Entering directory '/home/boron/agl-app/newservice/build'
+    make[3]: Leaving directory '/home/boron/agl-app/newservice/build'
+    [100%] Built target autobuild
+    make[2]: Leaving directory '/home/boron/agl-app/newservice/build'
+    make[1]: Leaving directory '/home/boron/agl-app/newservice/build'
+    make[1]: Entering directory '/home/boron/agl-app/newservice/build'
+    make[2]: Entering directory '/home/boron/agl-app/newservice/build'
+    make[3]: Entering directory '/home/boron/agl-app/newservice/build'
+    make[4]: Entering directory '/home/boron/agl-app/newservice/build'
+    Scanning dependencies of target prepare_package
+    make[4]: Leaving directory '/home/boron/agl-app/newservice/build'
+    make[4]: Entering directory '/home/boron/agl-app/newservice/build'
+    [  6%] Generating package
+    [ 12%] Generating package/bin
+    [ 18%] Generating package/etc
+    [ 25%] Generating package/lib
+    [ 31%] Generating package/htdocs
+    [ 37%] Generating package/var
+    make[4]: Leaving directory '/home/boron/agl-app/newservice/build'
+    [ 37%] Built target prepare_package
+    make[4]: Entering directory '/home/boron/agl-app/newservice/build'
+    Scanning dependencies of target prepare_package_test
+    make[4]: Leaving directory '/home/boron/agl-app/newservice/build'
+    make[4]: Entering directory '/home/boron/agl-app/newservice/build'
+    [ 43%] Generating package-test
+    [ 50%] Generating package-test/bin
+    [ 56%] Generating package-test/etc
+    [ 62%] Generating package-test/lib
+    [ 68%] Generating package-test/htdocs
+    [ 75%] Generating package-test/var
+    make[4]: Leaving directory '/home/boron/agl-app/newservice/build'
+    [ 75%] Built target prepare_package_test
+    make[4]: Entering directory '/home/boron/agl-app/newservice/build'
+    Scanning dependencies of target populate
+    make[4]: Leaving directory '/home/boron/agl-app/newservice/build'
+    [ 75%] Built target populate
+    make[4]: Entering directory '/home/boron/agl-app/newservice/build'
+    Scanning dependencies of target widget_files
+    make[4]: Leaving directory '/home/boron/agl-app/newservice/build'
+    make[4]: Entering directory '/home/boron/agl-app/newservice/build'
+    [ 81%] Generating package/icon.png
+    [ 87%] Generating package/config.xml
+    make[4]: Leaving directory '/home/boron/agl-app/newservice/build'
+    [ 93%] Built target widget_files
+    make[4]: Entering directory '/home/boron/agl-app/newservice/build'
+    Scanning dependencies of target widget
+    make[4]: Leaving directory '/home/boron/agl-app/newservice/build'
+    make[4]: Entering directory '/home/boron/agl-app/newservice/build'
+    [100%] Generating hellocount.wgt
+    NOTICE: -- PACKING widget hellocount.wgt from directory /home/boron/agl-app/newservice/build/package
+    ++ Install widget file using in the target : afm-util install hellocount.wgt
+    make[4]: Leaving directory '/home/boron/agl-app/newservice/build'
+    [100%] Built target widget
+    make[3]: Leaving directory '/home/boron/agl-app/newservice/build'
+    make[2]: Leaving directory '/home/boron/agl-app/newservice/build'
+    make[1]: Leaving directory '/home/boron/agl-app/newservice/build'
+  ```
+
+  - The `hellocount.wgt` file is packaged and available at `~/agl-app/newservice/build`.
+
+### 9. Install the service
+
+  - Local System :
+    ```sh
+    # Copy hellocount.wgt to remote AGL system
+    $ scp ~/agl-app/newservice/build/hellocount.wgt root@<ip-address>:/home/0/
+    ```
+
+  - Remote AGL System :
+    ```sh
+    # Install using the service using afm-util
+    $ afm-util install ./hellocount.wgt
+    # Reboot the system
+    $ reboot -f
+    ```
\ No newline at end of file