TFTP DFU Block Size

RE: TFTP DFU Block Size

Stian Røed Hafskjold — Wed, 22 Mar 2017 11:59:05 GMT

Can you please post some wireshark sniffer logs? Start wireshark on the bt0 interface. Then we can see if the nRF side or the PC side rejects the blocksize.

If the purpose of increasing the block size is to increase the speed, you should consider lowering the connection interval to 7.5ms. You can do this by writing:

echo 7.5 > /sys/kernel/debug/bluetooth/hci0/conn_min_interval
echo 7.5 > /sys/kernel/debug/bluetooth/hci0/conn_max_interval

RE: TFTP DFU Block Size

Amy — Thu, 02 Mar 2017 04:25:44 GMT

yes, it still works with APP_TFTP_BLOCK_SIZE = 512.

I have added those 2 definition, and my tftp configuration is :

TFTP_USERNAME="pi"
TFTP_DIRECTORY="/srv/tftp"
TFTP_ADDRESS="[::]:69"
TFTP_OPTIONS="-s -l -6 -c --blocksize 1024"

I also tried to use the example tftp_dfu from SDK, but it did not work too. The LOG looks the same with my application.

RE: TFTP DFU Block Size

Ole Bauck — Tue, 28 Feb 2017 10:21:58 GMT

And it still works with APP_TFTP_BLOCK_SIZE set to 512 bytes? You have added the --blocksize option to the tftp server?

I took the tftp dfu example from the SDK, applied these three changes and it worked.

RE: TFTP DFU Block Size

Amy — Tue, 28 Feb 2017 04:02:46 GMT

Thanks for your recommendation, but it still not works.

The problem is still the same no matter I try to add MEMROY_MANAGER_XLARGE_BLOCK_COUNT and MEMORY_MANAGER_XLARGE_BLOCK_SIZE as you mentioned, or edit the MEMROY_MANAGER_LARGE_BLOCK_SIZE to larger number.

RE: TFTP DFU Block Size

Ole Bauck — Fri, 24 Feb 2017 15:12:33 GMT

The problem is actually with the memory manager. The largest blocksize is defined to be 1024 bytes, but the data with overhead can be up to 1280 bytes. You can add these two lines to sdk_config.c (preferably under MEMORY_MANAGER_LARGE_BLOCK_SIZE):

#define MEMORY_MANAGER_XLARGE_BLOCK_COUNT 2
#define MEMORY_MANAGER_XLARGE_BLOCK_SIZE 1280

RE: TFTP DFU Block Size

Amy — Thu, 23 Feb 2017 04:30:51 GMT

I have tried it but the situation is still the same !!!!!

RE: TFTP DFU Block Size

Ole Bauck — Wed, 22 Feb 2017 16:07:09 GMT

Can you try to change the max block size on the tftp server (see here)?:

cd /etc/default/
nano tftpd-hpa

in the option quotes add --blocksize 1024

save it and then restart tftpd 

/etc/init.d/tftpd-hpa restart