Build string to send in socket to server

[Shooshpanius]

I try to send message in websocket from other soft, wich must send only string.

I intercept string in demo chat and have this:

{
"$type": "WebSocketManager.Common.Message",
"messageType": 1,
"data": {
"$type": "WebSocketManager.Common.InvocationDescriptor",
"methodName": "SendMessage",
"arguments": {
"$type": "System.Object[]",
"$values": [
{
"$type": "System.String",
"$value": "test"
}
]
},
"identifier": {
"$type": "System.Guid",
"$value": "00000000-0000-0000-0000-000000000000"
}
}
}

When i send this string to websocket, i get error:

Newtonsoft.Json.JsonSerializationException: "Type specified in JSON 'WebSocketManager.Common.InvocationDescriptor, WebSocketManager.Common, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' is not compatible with 'System.String, System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e'. Path 'data.$type', line 5, position 59."

Please, how the string to send to server must be?