Ssh into old embedded Linux systems running dropbear

Recently, openssh disabled the use of ssh-rsa, so you may now see something like the following if you try to ssh into an old system running dropbear:

Unable to negotiate with port 22: no matching host key type found. Their offer: ssh-rsa

The workaround is to put something like the following in you ~/.ssh/config file:

   HostkeyAlgorithms +ssh-rsa
   PubkeyAcceptedAlgorithms +ssh-rsa

ah so its finally in thats good, see Demystifying “ssh-rsa” in OpenSSH Deprecation Notice | by Dorai Ashok S A | Level Up Coding