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I want to set up a serial communication between arduino and nrf52840 ?

i have programmed a arduino to send data(int value) on tx ,rx pin .How shoul i set up the nrf52 (the pin no of rxd and txd on nrf are p0.6 and p0.8).Which example should i begin with? Is ther a tutorial for serial commmunication to read and store it in a variable.So later on i can use the coap iot example to upload the data on cloud or read on coap cupper client.(for now i want to read the data on the pc). .

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