[Solved] Unable to download the backup file using curl

[rajil]

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Your questions

I am trying to root a Dreame robot, and want to backup the config file. I followed the instruction to create the backup file.

The /tmp/backup.tar file exists on the device.

ssh -i mykey root@192.168.5.1
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    _   _   _                        _     _                  
   / \ | |_| |__   ___ _ __   __ _  | |   (_)_ __  _   ___  __
  / _ \| __| '_ \ / _ \ '_ \ / _` | | |   | | '_ \| | | \ \/ /
 / ___ \ |_| | | |  __/ | | | (_| | | |___| | | | | |_| |>  < 
/_/   \_\__|_| |_|\___|_| |_|\__,_| |_____|_|_| |_|\__,_/_/\_\
                                                              
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 Athena Linux (r9302_release)
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built with dustbuilder (https://builder.dontvacuum.me)
2025-07-12T21:16:12Z
1574
BusyBox v1.36.0 (2023-09-05 11:00:32 CST) multi-call binary.

Usage: basename FILE [SUFFIX] | -a FILE... | -s SUFFIX FILE...

Strip directory path and SUFFIX from FILE

        -a              All arguments are FILEs
        -s SUFFIX       Remove SUFFIX (implies -a)
[root@r9302_release:~]# ls -la /tmp/backup.tar 
-rw-r--r--    1 root     root         79872 Jan  1 08:14 /tmp/backup.tar

The bridge is also up,

valetudo-helper-httpbridge-amd64
Starting valetudo-helper-httpbridge
Note that uploads will happily overwrite existing files. Please be careful


valetudo-helper-httpbridge started successfully.
It is serving "/tmp/www" via:


http://192.168.5.100:1337/
Download example:       wget http://192.168.5.100:1337/file.tar
Upload example:         curl -X POST http://192.168.5.100:1337/upload -F 'file=@./file.tar'
File listing is also available

However, if i try to download the file i get an error,

curl -X POST http://192.168.5.100:1337/upload -F 'file=@/tmp/backup.tar'
curl: (26) Failed to open/read local data from file/application

As a last resort i tried to scp the file over but that failed,

scp -i mykey root@192.168.5.1:/tmp/backup.tar .
sh: /usr/libexec/sftp-server: not found

How do i get the backup.tar file off the robot?

[rajil]

I realized this needs to be done in the robot ssh session.