* "version": 2, // The version of the packet being sent. Compare to SMS_REQUEST_PACKET_VERSION before attempting to handle.
* "addresses": <List<Addresses>>, // The one or many targets of this message
* "messageBody": "Hi mom!", // Plain-text string to be sent as the body of the message
* "attachments": <List<Attachment>>,// Send one or more attachments with this message. See AttachmentContainer documentation for formatting. (Optional)
* "sub_id": 3859358340534 // Some magic number which tells Android which SIM card to use (Optional, if omitted, sends with the default SIM card)