首先我们得看一下环境变量VSOMEIP_CONFIGURATION，根据用户手册

* `VSOMEIP_CONFIGURATION`: vsomeip uses the default configuration file `/etc/vsomeip.json`
   and/or the default configuration folder `/etc/vsomeip`. This can be overridden by a
   local configuration file `./vsomeip.json` and/or a local configuration folder `./vsomeip`.
   If `VSOMEIP_CONFIGURATION` is set to a valid file or directory path, this is used instead
   of the standard configuration (thus neither default nor local file/folder will be parsed).

• vsomeip默认使用配置文件 /etc/vsomeip.json或者包含配置文件的文件夹/etc/vsomeip，如果当前目录存在 /etc/vsomeip.json或者包含配置文件的文件夹/etc/vsomeip，优先使用当前目录的配置文件，用户可通过配置VSOMEIP_CONFIGURATION环境变量覆盖当前和默认的配置文件。

我们来看一下配置文件内容，以上篇文章的配置文件为例：

{
    "unicast":"192.168.4.1",
    "netmask":"255.255.255.0",
    "network":"vsomeip",
    "logging":
    {
        "level":"debug",
        "console":"true",
        "dlt":"true"
    },
 
    "applications":
    [
        {
            "name":"service1",
            "id":"0x1000"
        },
        {
            "name":"service2",
            "id":"0x2000"
        }
    ],
    "services":
    [
        {
            "service":"0x1001",
            "instance":"0x0001",
            "unicast":"192.168.4.1",
            "unreliable":"40001",
            "reliable" : { "port" : "40001", "enable-magic-cookies" : "false" },
            "multicast" : 
            { 
                "address" : "239.0.4.1", 
                "port" : "40001"
            },
            "events" : 
            [
                {
                    "event" : "0x9001",
                    "is_field" : "true",
                    "is_reliable" : "false"
                },
                {
                    "event" : "0x9002",
                    "is_field" : "true",
                    "is_reliable" : "false"
                },
                {
                    "event" : "0x9003",
                    "is_field" : "true",
                    "is_reliable" : "false"
                }
            ],
            "eventgroups" :
            [
 
                {
                    "eventgroup" : "0x0005",
                    "events" : [ "0x9001", "0x9002", "0x9003"],
                    "is_multicast" : "false"
                }
            ]
        },
        {
            "service":"0x2001",
            "instance":"0x0001",
            "unicast":"192.168.4.1",
            "unreliable":"40002",
            "reliable" : { "port" : "40002", "enable-magic-cookies" : "false" },
            "multicast" : 
            { 
                "address" : "239.0.4.1", 
                "port" : "40002"
            },
            "events" : 
            [
                {
                    "event" : "0x9001",
                    "is_field" : "true",
                    "is_reliable" : "false"
                },
                {
                    "event" : "0x9002",
                    "is_field" : "true",
                    "is_reliable" : "false"
                },
                {
                    "event" : "0x9003",
                    "is_field" : "true",
                    "is_reliable" : "false"
                },
                {
                    "event" : "0x9004",
                    "is_field" : "true",
                    "is_reliable" : "false"
                }
            ],
            "eventgroups" :
            [
                {
                    "eventgroup" : "0x0006",
                    "events" : [ "0x9001", "0x9002", "0x9003", "0x9004"],
                    "is_multicast" : "false"
                },
                {
                    "eventgroup" : "0x0007",
                    "events" : [ "0x9001" ],
                    "is_multicast" : "false"
                }
            ]
        }
	
    ],
    "routing":"service1",
    "service-discovery":
    {
        "enable" : "true",
        "multicast" : "239.0.4.1",
        "port" : "30490",
        "protocol" : "udp",
        "initial_delay_min" : "100",
        "initial_delay_max" : "1000",
        "repetitions_base_delay" : "30",
        "repetitions_max" : "5",
        "ttl" : "5",
        "cyclic_offer_delay" : "1000"
     }
}

• "unicast"：本机的IP地址 192.168.4.1

• "netmask"：本机的掩码 255.255.255.0

• "network"：用于本机存在多个routing managers的场景，参数可以修改/dev/shm共享内存的字段以及/tmp下socket的名字，默认该参数为vsomeip, 对应共享内存为/dev/shm/vsomeip,socket命名为/tmp/vsomeip-$CLIENTID。

日志模块logging

• "level"：配置日志的级别，可选的配置有：trace,debug,info,warnning,error,fatal

• "console"：日志是否通过控制台输出，可选的配置有 true，false

• "file"：有两个参数

                enable：是否创建一个log文件, 可选的值为true，false

                path: 用于存放生成的日志文件的绝对路径

• "dlt"：配置是否使用Diagnostic Log and Trace(DLT)，可选的值有true,false

应用模块applications：

• "name"：应用的名字
• "id"：应用程序的ID

服务模块services：

• "service"：服务的ID
• "instance": instance ID
• "unicast": 服务实例的单播地址
• "reliable": 用于TCP服务

        port：tcp endpoint的端口号

        enable-magic-cookies: 是否使用magic cookies（可选 true false）

• "unreliable"：用于UDP服务，UDP的端口号
• "multicast": 用于发布eventgroup

        address：组播IP地址

        port：组播端口号

• "events": 服务的events

        event： event ID

        is_field: 配置该event是否为filed类型

        is_reliable：配置该event是否为tcp（true false）

• "eventgroups": 事件组

        eventgroup： 事件组ID

        events: 包含的event id

        multicast: 是否支持组播（true false）

• "routing": 字符串（应用的名字）,配置routing manager

服务发现模块service-discovery

• "enable": 配置服务发现模块是否使能（true,false）
• "multicast": 服务发现使用的组播地址
• "port": 服务发现使用的端口号
• "protocol": 服务发现使用的协议（tcp udp）
• "initial_delay_min": Minimum delay before first offer message.
• "initial_delay_max": Maximum delay before first offer message.
• "repetitions_base_delay": Base delay sending offer messages within the repetition phase.
• "repetitions_max": Maximum number of repetitions for provided services within the 
  repetition phase.
• "ttl": Lifetime of entries for provided services as well as consumed services and eventgroups.
• "cyclic_offer_delay": Cycle of the OfferService messages in the main phase.