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From: | Thomas Richter (TCD - DE/Dresden) |
Subject: | [lwip-users] "flow control" manipulation with lwIP-1.3.2 |
Date: | Wed, 30 Mar 2011 09:02:07 +0200 |
User-agent: | Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.2.15) Gecko/20110303 Lightning/1.0b2 Thunderbird/3.1.9 |
Hi, I´m searching for a possibility to manipulate the "flow control" of TCP data handling. I know that there is the parameter "Window" in the TCP header (see http://en.wikipedia.org/wiki/Transmission_Control_Protocol#TCP_segment_structure). My task is to transport TCP data over Ethernet interface and there are some needs to make an external flow control. In other words I get the information that the receiver supports two states: "Receive Ready" (RR) and "Receive Not Ready" (RNR). If the state "RNR" occurs the other side of the Ethernet connection needs this information and then it have to stop sending frames. Not until the state "RR" arised then the data processing shall be continued. For this I would using the parameter "window" in TCP header and set them to 0 with lwIP. But what can I do to generate this? Can anybody help me? Thanks for any help. Best regards Thomas
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