I like to use Node-RED to power on my home cinema projector over TCP/IP.
A so-called 3-way handshake is used to establish a connection and then a hex command must be sent.
When I open the connection with a "tcp in" node I get the first answer for the connection (PJ_OK, as a string) ... now I need to send PJREQ as a string and wait for PJACK as a reply to finally send the real comand (HEX: 21 89 01 50 57 30 0A)
Any ideas to get this solved in Node-RED? It looks so simple, but I just can't get it to work!