DLREQUEST_RCV_BUSY

Set or clear the local receiver busy state. When the local receiver busy state is set, the link layer protocol informs the peer which stops sending data until the busy state is cleared. The application uses this request to control the flow of received data. The local receiver busy condition is set automatically by the API if the receiver buffers are exhausted. In this case, the application must use DLREQUEST_RCV_BUSY to clear the busy condition manually, usually after reading all available data from the API.