i own an esp8266/Nodemcu.
I have some "reading knowledge" of espbasic, nothing else.
The communication model is exactly like this:
Computer -> Putty-> Telnet ( TCP/IP) -> WIFI-> Esp8266 ( Nodemcu) -> serial/rs232 -> Device , and vice versa.
Problem seems to be, that there is no Implemenation of TCP/IP Funktions, just only UDP in espbasic?!
THX