The specified link instance is ready to accept more send data from the
application. If the application encounters an ERROR_BUSY
return code when sending data with DLREQUEST_DATA or DLREQUEST_UNITDATA, the application should
wait until the API generates this primitive before attempting to send more
data.
| Type | DLINDICATION_SEND_READY |
| Flags | 0 |
| Size | 0 |
| Buffer | Unused |
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