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Uart nodemcu

I have following setup -

3.3v atmega connected to arduino board - only 3.3,gnd,tx,rx - which is connected to pc-usb on com3

Nodemcu with mongoose connected to pc usb on com5

Tx0 and gnd connected to aforementioned atmega setup

Now I have written c code for mongoose to write "1" on uart. I have also disabled debug.stdout Nd debug.stderr by setting them to -1

Problem is - that uart data shows up in mos webconsole connected via port 5 but does not arrive at either atmega or arduino board on com3

Please help me if there is any solution to this strange issue.

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