Can I duplicate Rx on raspberry? If its possible how it will be? I need to connect 2 device which connect via gpio tx/rx.
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Your question is ambiguous.
Most Pi models have only 1 accessible serial port on BCM 14,15. They have a second, which is often used for Bluetooth, but is inaccessible.
The Pi4 has 6 UART , although there are restrictions on which can be used.
If you want to use 2 serial devices this is not possible on a single port. You can send to as many devices as you want, but only receive on one at a time.
Milliways
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If you use a serial to USB converter you can connect multiple devices via USB (as well as one via TXD/RXD).
joan
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