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Inter processor communication between NRF52840 and NRF9160 on Thingy91

Hi,

How is the Inter processor communication handled between NRF52840 and NRF9160 in Thingy91 ? It was not very clear from the schematics for me

Can you tell me which pins on the NRF52840 and NRF9160 are connected to each other ? And what is the interface ( UART/SPI/I2C or something else ? )

Regards

Ashutosh