how to use the DFU example?

Question

hi,everyone 
 I want to run the DFU example in meshV3.1.0 . but i still can't understader how to run it . below is my understanding: 
 1.ther are must have 2 devices , A device use serial interface communicate with PC , B device is the targer device to upgrade. 
 2.PC send packet to A by serial , and A send packet to B by mesh network. 
 3.in order to send hex data in specially format like below , nordic supply a kit name nrfutil 
 
 4.how to use nrfutil ? where I can type those COMMED , i am using Windows cmd.exe.when i type in the command below ,it seems doest work like below :

Edvin · Accepted Answer

1: no. They do not need provisioning for the DFU procedure to work. The phone can't discover them because they do not advertise with the proxy service, which is used for the provisioning process. 2: Try the following: Before trying the troubleshooting: bootloader_verify, can you try to write nrfutil --verbose dfu serial -pkg -p -b 115200 -fc --mesh, like described right before the troubleshooting section here: https://www.nordicsemi.com/DocLib/Content/SDK_Doc/Mesh_SDK/v3-1-0/md_doc_getting_started_dfu_quick_start So add the "--verbose" argument. What does it say then? When you try the bootloader_verify: can you check what python version you are using? Type "python --version" in your cmd window. also, what nrfutil version do you have? Try: "nrfutil version" in your cmd window. Best regards, Edvin

how to use the DFU example?

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