Sending messages works only in one direction

[muesgit]

Hello Mr. Snigirev,

Ive done a simple test to send Information from an Arduino with Ethernet Shield to another Arduino via Serial TX/RX and back.
I was able to use netcat to send messages vie Ethernet to Serial. When i try to send a message back by typing into the Serial monitor of arduino (arduino without ethernet shield), i can only see the configuration in the serial monitors of both arduinos. My input message is not visible.
As i understood, everytime when i type something into the serial and send it to the Arduino with ethernet shield i get the information printed on the usb-channel. I guess i cant see anything because i am sharing the pin 0 and 1.
I wasnt able to see what and if anything is transferred to the ethernet port. I also tried to listen to the port 23 via netcat but it isnt possible.

Do u have any suggestions on how to solve this problem.?

[muesgit]

I solved the problem. It was what i was already guessing that using pin 0 und 1 is not possible because they are reserved for USB. Since I have an MEGA I renamed Serial1 to Serial3, reattached the pins and voila its working.
I thought i must use SoftwareSerial but luckily I didnt have to change your code 👯