is the successor of the FreeRTOS-Plus-UDP that you are using. And as the name says, it also includes the TCP protocol.
The TCP code will only be included if
There is an unpublished FreeRTOS+TCP driver for LPC18xx, but unfortunately (AFAIK) there is no port for LPC17xx yet.
What you can do is the following: drop an email ( to “h.tibosch” at the domain “freertos.org” ), and I will send you the current LPC18xx driver for +TCP. It shouldn’t be too difficult to get that working for a LPC17xx 🙂