void sendCustomNotification(String conversationId, String content, V2NIMSendCustomNotificationParams params, V2NIMSuccessCallback< Void > success, V2NIMFailureCallback failure)
发送自定义通知, 主要以下MsgType 发送该通知后, 接收端SDK会抛出onReceiveCustomNotification回调 CUSTOM_P2P_MSG(100),...