AT commands for TCP connection on WP7700


We are developing a product based on WP7700 (HL7800 is desired, because of its unavailability at the moment, WP7700 is used for initial prototype with a plan to move to HL7800 for production). Depending on our project requirements (specially low power requirement) we are using WP7700 just as a CAT-M1/NB-IoT module (by mapping AT services to UART1) rather than using WP7700 as an application processor. I was able to successfully do network and GPS operations over UART1. Now my question is how to establish a TCP client over the AT commands for WP7700. I could not find AT commands for managing TCP connections in WP700 AT commands document. Any thought on this?