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Communication between 2 ESP

Hi I am trying to establish communication between two ESPs using UART0. I am able to send and receive data when directly connecting TX-RX, RX-TX, which I know by checking the available bytes in the respective buffers. However I am not able to reproduce the perfect data at the receiving ESP. Follwing are my questions,
1. How do I read the data in the receiving ESP?
2. I am planning to use RF modules for wireless communication between ESPs. Any suggestion regarding this?


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