raiden00pl opened a new pull request, #3812:
URL: https://github.com/apache/nuttx-apps/pull/3812

   ## Summary
   
   tftpput_cb() calls tftp_rcvack() with a NULL blockno for the ACK of the 
write request, but tftp_rcvack() always stored the received block number. On 
targets where address 0 is not writable (e.g. sim) every TFTP put crashed.
   
   Store the block number only if the caller asked for it.
   
   ## Impact
   
   bug fix
   
   ## Testing
   
   detected by automate tests from https://github.com/railab/nuttx-testlab


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