Error connection with sudph

[ersonp]

Describe the bug
The sudph transport creation errors while setting up transport between two visors with public ip's.

Environment information:

From:

• OS: Linux
• Platform: Linux 5.11.4-arch1-1 x86_64

To:

• OS: Linux
• Platform: Linux 5.4.0-72-generic x86_64

Steps to Reproduce
Steps to reproduce the behavior:

1. Run two visors on two different machines with public IP's
2. Set up a sudph transport from one to another
3. See error

Actual behavior
The visor that is used to set up transport throws a nil pointer exception.
from.txt
The other visor gives an error
to.txt

Expected behavior
sudph transport should be established without error.

Additional context
Both the visors were hosted on Linode. Nil pointer exception is shown only on develop, and on master, there is no exception but the sudph transport is initilised in offline state with

[2021-07-16T11:04:00Z] ERROR [sudph]: Failed to resolve UDP address {"02e398f3da0ed1c930f7d295185759c98511c75e112596007e4481b1fe666552cf" "139.162.141.220"} error="address 139.162.141.220: missing port in address"

this error on the second visor.

Possible implementation
Hints to fix the bug.