Thanks for the response. I am sending files from the pc to uboot. I tried wget and still get connection error -13 from lwip. It's coming from the function bound by tcp_err.
Nathan Yonkee Sandia National Laboratories Department 5324, NPC Motion Systems [email protected] 505-844-7031 -----Original Message----- From: U-Boot <[email protected]> On Behalf Of Nathaniel Hourt Sent: Wednesday, November 19, 2025 10:55 PM To: [email protected] Subject: [EXTERNAL] Re: tcp server with tftp [You don't often get email from [email protected]. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] On 2025-11-19 17:16, Yonkee, Nathan Paul wrote: > Hello all, I am writing some custom uboot to run a tcp server to > communicate with our lab computer. I would like to be able to do a > tftp file transfer while the server is connected, but when I try I get > error -13. I wrote a custom tcp server with lwip and I am using > tftp_loop() to do the tftp transfer. TFTP is usually a UDP-based protocol... Are you sure you mean to be using TCP with it? If you're just looking to send a file to your device with u-boot, have you looked at the wget command? https://docs.u-boot.org/en/latest/usage/cmd/wget.html Or are you trying to send a file from u-boot to your lab computer? - Nathaniel
