Yun stucked if connect serial wire with uno. please help me

Official Hardware Classic Yún
1

I have known to use hardware serial of yun, I have to use Serial1. so I have a test serial communication between PC and Yun using Serial. and It works well. then also I have a test PC and Uno. and it works well. but when I just connect yun and uno I think yun is stucked becasue i can see uno's loop is working. I have spent a huge time to solve this problem but I think I can not solve this myself. please give me any opinion. thank you. I open my all code attached

uno.ino (8.67 KB)

yun.ino (9.96 KB)

2

The Yun's serial TX and RX pins are used by the Bridge to talk to the linux side of the board.
If you are trying to connect the Uno's TX/RX to the Yun's TX/RX 0/1 pins then it won't work if you are using the Bridge.

Instead of using Serial1 per your sketch on the Yun, include the SoftwareSerial library and declare a set of pins to use. You can only use certain pins for RX on the Yun (same limitations as the Leonardo).