I try to integrate the CoAP Server and TFTP DFU example code, and it works well.
[ENV]
- IoT SDK v0.9.0
- nRF52832 DK
According to the specification, the MTU of L2CAP is 1280 bytes.
The default APP_TFTP_BLOCK_SIZE in the TFTP DFU example code is 512 bytes.
When I try to increase it to 1024 bytes, it didn't work.
I try to look the LOG and find it works well before starting to receive the image file.
it will trigger STATE_RECV_COMPLETE state just after sending block 0 of 55 ACK instead of calling iot_tftp_resume() and receive next block of data.
the LOG shows below:
[TFTP]: Set value: /dfu/app/iot_app_dfu_prox.bin.
[TFTP]: Set value: octet.
[TFTP]: Set option: tsize with value: 0.
[TFTP]: Set option: timeout with value: 3.
[TFTP]: << iot_tftp_get
[TFTP]: << client_process
[TFTP]: >> client_process
[TFTP]: Received OACK.
[TFTP]: Negotiate options:
[FILE][PSTORAGE][C]VERIFY MODULE INITIALIZED()
[FILE][PSTORAGE][C]check module param
[FILE][PSTORAGE][C]check block id
[FILE][PSTORAGE][C]check module_param_cb
[TFTP]: TSIZE: 57012
[TFTP]: TIMEOUT: 3
[TFTP]: BLKSIZE: 1024
[TFTP]: Create ACK packet.
[TFTP]: Send packet.
[TFTP]: Send packet to UDP module.
[TFTP]: Recv code: 00000000.
[TFTP]: << client_process
[TFTP]: >> client_process
[TFTP]: Received DATA.
[TFTP]: Received next DATA (n+1).
[TFTP]: Create ACK packet.
[TFTP]: Send block 0 of 55 ACK.
[TFTP]: << client_process
[TFTP]: >> iot_tftp_resume
[TFTP]: Send packet.
[TFTP]: Send packet to UDP module.
[TFTP]: Recv code: 00000000.
[TFTP]: Complete due to STATE_RECV_COMPLETE state.
[TFTP]: Raise TRANSFER COMPLETE event.
[TFTP]: Reset instance 0.
[APPL]: In TFTP Application Handler.
[APPL]: TFTP transfer complete - size 57012.
[APPL]: New firmware file successfully downloaded.
[IOT_DFU]: >> iot_dfu_firmware_validate
[IOT_DFU]: Application CRC mismatch.
[IOT_DFU]: CRC in device is 64028.
[IOT_DFU]: << iot_dfu_firmware_validate
[** ASSERT **]: Error 0x0000000B, Line 0, File
but decrease the APP_TFTP_BLOCK_SIZE works well.
I have no idea how to solve it, did I miss anything? what is the limitation of APP_TFTP_BLOCK_SIZE?
Sincerely, Thank you.
