// Private key
nrfutil keys generate dfu_private_key.pem
// Public key
nrfutil keys display --key pk --format code dfu_private_key.pem --out_file dfu_public_key.c

nrfutil pkg generate dfu_app.zip --hw-version 52 --application-version 0x01 --application app.hex --key-file private_key.pem
nrfutil pkg generate dfu_app.zip --hw-version 52 --sd-req 0x0103 --application-version 0x01 --application app.hex --key-file private_key.pem

// To get soft-device id
nrfutil pkg generate --help 

|s112_nrf52_6.0.0|0xA7|
|s112_nrf52_6.1.0|0xB0|
|s112_nrf52_6.1.1|0xB8|
|s112_nrf52_7.0.0|0xC4|
|s112_nrf52_7.0.1|0xCD|
|s113_nrf52_7.0.0|0xC3|
|s113_nrf52_7.0.1|0xCC|
|s130_nrf51_1.0.0|0x67|
|s130_nrf51_2.0.0|0x80|
|s132_nrf52_2.0.0|0x81|
|s130_nrf51_2.0.1|0x87|
|s132_nrf52_2.0.1|0x88|
|s132_nrf52_3.0.0|0x8C|
|s132_nrf52_3.1.0|0x91|
|s132_nrf52_4.0.0|0x95|
|s132_nrf52_4.0.2|0x98|
|s132_nrf52_4.0.3|0x99|
|s132_nrf52_4.0.4|0x9E|
|s132_nrf52_4.0.5|0x9F|
|s132_nrf52_5.0.0|0x9D|
|s132_nrf52_5.1.0|0xA5|
|s132_nrf52_6.0.0|0xA8|
|s132_nrf52_6.1.0|0xAF|
|s132_nrf52_6.1.1|0xB7|
|s132_nrf52_7.0.0|0xC2|
|s132_nrf52_7.0.1|0xCB|
|s140_nrf52_6.0.0|0xA9|
|s140_nrf52_6.1.0|0xAE|
|s140_nrf52_6.1.1|0xB6|
|s140_nrf52_7.0.0|0xC1|
|s140_nrf52_7.0.1|0xCA|
|s212_nrf52_6.1.1|0xBC|
|s332_nrf52_6.1.1|0xBA|
|s340_nrf52_6.1.1|0xB9|