s on top of TCP without knowing the details (e.g. TLS, proxy connection).</li>
<li>This is achieved by simply including "lwip/altcp.h" instead of "lwip/tcp.h", replacing "struct tcp_pcb" with "struct altcp_pcb" and prefixing all functions with "altcp_" instead of "tcp_".</li>
</ul>
<p>With altcp support disabled (LWIP_ALTCP==0), applications written against the altcp API can still be compiled but are directly linked against the tcp.h callback API and then cannot use layered protocols. To minimize code chang