MessageBody Introduction

ZIM server supports developers to send different types of messages to the session through the server API, and the supported types are shown in the table below:

Message Type	MessageType Value	Applicable Conversation Type	Supports Broadcast to All Members
Text	1	One-on-one Chat Group chat Room	✔️
Command	2		✖
Image	11		✔️
File	12		✔️
Audio	13		✔️
Video	14		✔️
Custom	200		✔️
Pop-up	20	Room	✖

When you call the ZIM server interface to send messages, you need to pass the message content through the parameter MessageBody. The format of MessageBody varies depending on the message type. This article will introduce the corresponding parameters for each message type.

Text message, custom message and pop-up message

MessageBody structure

The MessageBody structure is the same for text messages, custom messages and pop-up messages, as described below:

Parameters	Type	Required or not	Description
Message	String	Yes	The message content, by default, is 2 KB. If necessary, please contact ZEGO technical support for configuration, with a maximum capacity of up to 32 KB.
ExtendedData	String	No	Extended field with a maximum length of 1 KB.
OfflinePush	Object	No	Offline Push, see OfflinePush introduction for more information.
HasReceipt	Number	No	Message includes a receipt: 0: No. 1: Yes. Warning Pop-up message does not support receipts.

OfflinePush introduction (inapplicable for room messages)

Parameters	Type	Required or not	Description
Enable	Number	No	Whether to enable offline push: 0：Not to push (default). 1：Push.
Title	String	No	The title of the offline push display.
Content	String	No	Offline Push Displayed Content
Payload	String	No	Extended fields allow developers to customise the behaviour after receiving an offline push message.
PushStrategyId	String	No	The customized push strategy, which should be configured by ZEGOCLOUD techinical support. Warning This parameter only support when requesting to push message to all users.
PushImageInfo	Object	No	Image push information. Warning This parameter only support when requesting to push message to all users.
Apns	Object	No	Apple push extra information.
Image	String	No	This field is used to identify the image URL pushed by APNs. When the client receives this field, the client can download the image and display it in a pop-up window.
FCM	Object	No	Google FCM configuration.
Image	String	No	Image URL. The image size should be no more than 1 MB (megabyte).
Icon	String	No	Icon URL.

MessageBody example

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{
    "MessageBody": {
        "Message":"hello world",
        "ExtendedData":"extendedData",
        "OfflinePush" :{
            "Enable":0, 
            "Title":"Title",
            "Content":"Content", 
            "Payload":"data"
        },
        "HasReceipt": 1
    }
}

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Command message

MessageBody structure

Parameters	Type	Required or not	Description
Message	String	Yes	The content of signaling messages is by default limited to 2 KB. If necessary, please contact ZEGO technical support for configuration, and the maximum limit can be extended to 32 KB. Warning If the message is base64 encoded, the length limit here refers to the original message length before base64 encoding.
ExtendedData	String	No	Extended field, up to 1 KB in length.
IsBase64	Number	No	Whether the message is base64 encoded. 0： No (default). 1：Yes. After receiving this message, the ZIM server will perform base64 decoding to obtain the actual message content, and then send it to the ZIM SDK.

MessageBody example

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{
    "MessageBody": {
        "Message":"hello world",
        "ExtendedData":"extendedData",
        "IsBase64":0
    }
}

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Picture message

MessageBody structure

Parameters	Type	Required or not	Description
Message	String	Yes	Picture message content, a JSON byte string generated according to `Message structure` , defaults to 2 KB. Please contact ZEGO technical support for configurations up to 32 KB if needed.
ExtendedData	String	No	Extended field, up to 1 KB in length.
OfflinePush	Object	No	Offline Push, see OfflinePush introduction for more information.
HasReceipt	Number	No	Message includes a receipt: 0: No. 1: Yes.

Message structure

Parameters	Type	Required or not	Description
Uid	String	Yes	The unique ID of the image, whihc is generated by the developer.
Origin	Object	Yes	Original image.
Url	String	Yes	The URL address of the image, with a maximum length of 500 bytes.
Width	Number	Yes	Picture width in pixels（px).
Height	Number	Yes	Picture heightin pixels（px).
FileName	String	Yes	File name in the recommended format "xxx.file extension" with a maximum length of 150 bytes.
Size	Number	No	Image data size in bytes.

Message example

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{
    "Uid":"343649807833778782", 
    "Origin": {
        "Url":"https:xxx", 
        "Width":100,
        "Height":200
    },
    "FileName":"FileName.jpg", 
    "Size":1024
}

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MessageBody example

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{
    "MessageBody": {
        "Message":"", // The content of the image message is a JSON byte string generated according to the Message structure of the image message.
        "ExtendedData":"extendedData",
        "OfflinePush" :{
                "Enable":0, 
                "Title":"Title",
                "Content":"Content", 
                "Payload":"data"
        },
        "HasReceipt": 1
    }
}

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File message

MessageBody structure

Parameters	Type	Required or not	Description
Message	String	Yes	The content of the file message, a JSON byte string generated according to the `Message structure` of the file message, defaults to 2 KB. Please contact ZEGOCLOUD technical support for configurations up to 32 KB if needed.
ExtendedData	String	No	Extended field with a maximum length of 1 KB.
OfflinePush	Object	No	Offline Push, see OfflinePush introduction for more information.
HasReceipt	Number	No	Message includes a receipt: 0: No. 1: Yes.

Message structure

Parameters	Type	Required or not	Description
Uid	String	Yes	The unique ID of the file. generated by the developer.
Url	String	Yes	The URL address of the file, and the maximum length is 500 bytes.
FileName	String	Yes	File name in the recommended format "xxx.file extension" with a maximum length of 150 bytes
Size	Number	No	File data size in bytes.

Message example

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{
      "Uid":"343649807833778782", 
      "Url":"https:xxx", 
      "FileName":"FileName.txt", 
      "Size":1024
}

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MessageBody example

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{
    "MessageBody": {
        "Message":"", // The content of the file message, which is a JSON byte string generated according to the Message structure of the file message.
        "ExtendedData":"extendedData",
        "OfflinePush" :{
            "Enable":0, 
            "Title":"Title",
            "Content":"Content", 
            "Payload":"data"
        },
        "HasReceipt": 1
    }
}

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Audio message

MessageBody structure

Parameters	Type	Required or not	Description
Message	String	Yes	The content of the video message, a JSON byte string generated according to the `Message structure` of the audio message, defaults to 2 KB. Please contact ZEGO technical support for configurations up to 32 KB if needed.
ExtendedData	String	No	Extended field with a maximum length of 1 KB.
OfflinePush	Object	No	Offline Push, see OfflinePush introduction for more information.
HasReceipt	Number	No	Message includes a receipt: 0: No. 1: Yes.

Message structure

Parameters	Type	Required or not	Description
Uid	String	Yes	A unique ID for the audio. generated by the developer.
Url	String	Yes	URL address of the audi, and the maximum length is 500 bytes.
FileName	String	Yes	Audio name in the recommended format "xxx.file extension" with a maximum length of 150 bytes.
Size	Number	No	Audio data size in bytes.
MediaDuration	Number	No	Audio duration in seconds.

Message example

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{
    "Uid":"343649807833778782", 
    "Url":"https:xxx", 
    "FileName":"FileName.mp3", 
    "Size":1024,
    "MediaDuration":30
}

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MessageBody example

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{
    "MessageBody": {
        "Message":"", // The content of the audio message, a JSON byte string generated according to the Message structure of the audio message.
        "ExtendedData":"extendedData",
        "OfflinePush" :{
            "Enable":0, 
            "Title":"Title",
            "Content":"Content", 
            "Payload":"data"
        },
        "HasReceipt": 1
    }
}

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Video message

MessageBody structure

Parameters	Type	Required or not	Description
Message	String	Yes	Video message content, a JSON byte string generated according to `Message structure` defaults to 2 KB. Please contact ZEGO technical support for configurations up to 32 KB if needed.
ExtendedData	String	No	Extended field with a maximum length of 1 KB.
OfflinePush	Object	No	Offline Push, see OfflinePush introduction for more information.
HasReceipt	Number	No	Message includes a receipt: 0: No. 1: Yes.

Message structure

Parameters	Type	Required or not	Description
Uid	String	Yes	The unique ID of the file. generated by the developer.
Url	String	Yes	The URL address of the video, the maximum length is 500 bytes.
FileName	String	Yes	Video name in the recommended format "xxx.file extension" with a maximum length of 150 bytes.
Size	Number	No	Video data size, measured in bytes.
MediaDuration	Number	No	Video duration in seconds.
Thumbnail	Object	No	Video first frame.
Url	String	Yes（Only if the first frame of the video is required）	The URL address of the thumbnail, the maximum length is 500 bytes.
Width	Number	Yes（Only if the first frame of the video is required）	Picture width in pixels（px).
Height	Number	Yes（Only if the first frame of the video is required）	Picture height in pixels（px).

Message example

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{
    "Uid":"343649807833778782", 
    "Url":"https:xxx", 
    "FileName":"FileName.mp4", 
    "Size":1024,
    "MediaDuration":300,
    "Thumbnail": {
        "Url":"https:xxx", 
        "Width":100,
        "Height":200
    }
}

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MessageBody example

Untitled

{
    "MessageBody": {
        "Message":"", // The content of the video message as a JSON byte string generated from the Message structure of the audio message.
        "ExtendedData":"extendedData",
        "OfflinePush" :{
            "Enable":0, 
            "Title":"Title",
            "Content":"Content", 
            "Payload":"data"
        },
        "HasReceipt": 1
    }
}

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