OTA over serial failure| sdk 15.2

Question

Hello Everyone, 
 I am using nrf52832 and sdk 15.2 for ota over serial. I have made bootloader for OTA over UART and tested same with nrfutil using my dfu package file. firmware is upgraded successfully and working fine. 
 Now I need to upgrade firmware using host MCU. I tried sending dfu package file( .zip ) to nrf52832 over UART using slip librairy to upgrade firmware but it is not working. 
 Is there any compulsion to send Ping packet, PNR, MTU Packet, init packet, application and bootloader separately over UART? 
 Can we send directly dfu package created through nrfutil to nrf52832 from other MCU over UART? 
 Kindly suggest me right approach.

Somesh Burkule · Accepted Answer

Hello Edvin , 
 Thank you very much for your support. OTA over serial is sucessfull. 
 The problem was in the init packet. I had used softdevice.dat file for init packet. I converted this file into hex by online hex converter. now I used application.dat file for the init packet and sent over serial and after that sent app file and OTA worked. 
 Can you please tell me how to make init packet. please share init packet structure. I checked nrfutil code but its quit confusing for me. I have sent following packet. 
 uint8_t init_packet1[] = {8, 10, 67, 8, 1, 18, 63, 8, 3, 16, 2, 26, 2, 175, 1, 32, 0, 40, 0, 48, 0, 56, 196, 93, 66, 36, 8, 3, 18, 32, 14, 112, 16, 50, 29, 176, 115, 77, 235, 99, 214, 61, 143, 198, 237, 176, 123, 34, 183, 203, 209, 236, 252, 234, 62, 106, 216, 241, 146, 51, 178, 154, 72, 0, 82};
uint32_t init_packet1_len = 65;
uint8_t init_packet2[] = {8, 4, 8, 1, 18, 0};
uint32_t init_packet2_len = 6; 
 
 Thanks a lot again!! 
 Regards, 
 Somesh

Somesh Burkule · Answer

Hi Edvin , 
 Resolved. actually I was checking third byte in response is 0x01 or not(04 01 01 ) for init packet. if not gives an error. As I removed this code and tried OTA again it gets successfull. 
 Thank you for your help.

Somesh Burkule · Answer

Ok. I'll try with reducing size. 
 Edvin said: It works independently, but you don't want to do DFU over Serial and BLE at the same time. If you start with serial, then you finish that DFU with Serial. Don't to BLE simultaneously. But it is possible to support both protocols. 
 Nice. 
 Thanks for your support. 
 I'm closing this now.

OTA over serial failure| sdk 15.2

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