Packaging the Codec

This topic describes how to package the codec and prepare the package.

Packaging the Codec Using Maven

After the codec is programmed, use Maven to package the codec. On the Windows OS, perform the following steps:

Open the DOS window and access the directory where the pom.xml file is located.
Run mvn package.
After BUILD SUCCESS is displayed in the DOS window, open the target folder in the same directory as the pom.xml file to obtain the .jar package.
The naming rule of the .jar package is as follows: device type-manufacturer ID-device model-version.jar, for example: WaterMeter-Huawei-NBIoTDevice-version.jar.

Figure 1 Structure of the .jar file
- The com directory stores class files.
- The META-INF directory stores description files of .jar packages under the OSGi framework, which are generated based on configurations in the pom.xml file.
- The OSGI-INF directory stores service configuration files and is used to register the codec as a service for the platform to call. (Only one .xml file can be called.)
- Other .jar packages are .jar packages referenced by codecs.

Preparing a Codec Package

Create a folder named package, which contains the preload/ sub-folder.
Place the packaged .jar package in the preload/ folder.

Figure 2 Structure of the codec package

In the package folder, create the package-info.json file. The fields and templates in this file are described as follows:

NOTE:

The package-info.json file is encoded using UTF-8 without BOM. Only English characters are supported.

**Table 1** Description of fields in the package-info.json file
Field	Description	Mandatory or Optional
specVersion	Specifies the version of the description file. The value is fixed at 1.0.	Mandatory
fileName	Specifies the name of the software package. The value is fixed at codec-demo.	Mandatory
version	Specifies the version number of the software package. The version of the package.zip file must be the same as the value of bundleVersion.	Mandatory
deviceType	Specifies the device type, which must be the same as that defined in the profile file.	Mandatory
manufacturerName	Specifies the manufacturer name, which must be the same as that defined in the profile file. Otherwise, the package-info.json file cannot be uploaded to the IoT platform.	Mandatory
model	Specifies the product model, which must be the same as that defined in the profile file.	Mandatory
platform	Specifies the platform type, which is the operating system of the IoT platform on which the codec package runs. The value is fixed at linux.	Mandatory
packageType	Specifies the software package type. This field is used to describe the IoT platform module where the codec is deployed. The value is fixed at CIGPlugin.	Mandatory
date	Specifies the time when a packet is sent. The format is as follows: yyyy-MM-dd HH-mm-ss. For example, 2017-05-06 20:48:59.	Optional
description	Specifies the self-defined description about the software package.	Optional
ignoreList	Specifies the list of bundles to be ignored. The default value is null.	Mandatory
bundles	Specifies the description of a bundle. NOTE: A bundle is a .jar package in a compressed package. Only one bundle needs to be described.	Mandatory

**Table 2** Description of the bundles field
Field	Description	Mandatory or Optional
bundleName	Specifies the bundle name, which is consistent with the value of Bundle-SymbolicName in the pom.xml file.	Mandatory
bundleVersion	Specifies the bundle version, which must be the same as the value of version.	Mandatory
priority	Specifies the bundle priority. This parameter can be set to the default value 5.	Mandatory
fileName	Specifies the codec file name.	Mandatory
bundleDesc	Describes the bundle function.	Mandatory
versionDesc	Describes the functions and features of different versions.	Mandatory

Template of the package-info.json file

{
    "specVersion":"1.0",
    "fileName":"codec-demo",
    "version":"1.0.0",
    "deviceType":"WaterMeter",
    "manufacturerName":"Huawei",
    "model":"NBIoTDevice",
    "description":"codec",
    "platform":"linux",
    "packageType":"CIGPlugin",
    "date":"2017-02-06 12:16:59",
    "ignoreList":[],
    "bundles":[
    {
        "bundleName": "WaterMeter-Huawei-NBIoTDevice",
        "bundleVersion": "1.0.0",
        "priority":5,
        "fileName": "WaterMeter-Huawei-NBIoTDevice-1.0.0.jar",
        "bundleDesc":"",
        "versionDesc":""
    }]
}

Select all files in the package folder and compress them into a package.zip file.

NOTE:

The package.zip file cannot contain the package directory.