Serial pin in node-red

[jjcampis]

i´ve found this topic:

Cannot connect serial port(uart) to Node red Raspberry Pi

Hello, the topic is old, but I’m bringing it up again. I’m trying to connect a serial port (UART) to Node red but I’m not having any success. Can you explain in detail how the access to the serial port in Dietpi is organized, because from enough attempts, all of them have been unsuccessful. What is /dev/ttyS0 and /dev/ttyAMA0? In both cases, I get not connected in Node red. As far as I know, one port is software and the other is hardware, but both ports available in Node red are the same.

that says you have to add nodered to group dialout but… no success