SendSyncMessageRequest
Sends a sync message to the account’s devices
This type can contain the following fields:
| field | type | info | 
|---|---|---|
| account | String | |
| message_request_response | v1.JsonMessageRequestResponseMessage | This can be set to indicate to other devices about a response to an incoming message request from an unknown user or group. Warning: Using the BLOCK and BLOCK_AND_DELETE options relies on other devices to do the blocking, and it does not make you leave the group! | 
| view_once_open_message | v1.JsonViewOnceOpenMessage | This can be set to indicate to other devices about having viewed a view-once message. |