Fields for createMessage.
cmdId: number
Command id, such as one of BAICHUAN_CMD.
channelId: number
Channel id, such as one of BAICHUAN_CHANNEL.
messageId: number
Message id the reply will echo.
LEGACY only for the nonce request. Defaults to MODERN_WITH_OFFSET.
optional
extension: Uint8Array
The already encrypted channel extension, from extensionXml. It
goes before body, and payloadOffset points past it.
optional
body: Uint8Array
The already encrypted body. Defaults to empty.