Building a network transport implementation: 1. Go into the sub directory for the TCP/IP stack you are using (e.g. freertos_plus_tcp). 2. Build the wrapper file located in the directory (i.e. sockets_wrapper.c). 3. Select an additional folder based on the TLS stack you are using (e.g. using_mbedtls), or the using_plaintext folder if not using TLS. 4. Build and include all files from the selected folder.