For branch builds just pass the branch build key which is normally just the parent key with the branch id appended.
So if your parent key is BUILD-FULL your branch key will be BUILD-FULL0.
To script this better just expand the branches in the plan REST CALL to get the key name.
I'm still conviced that there should be an endpoint for all running builds.
We are using Atlasboard to show stuff on a screen in our office, and we want (beneath others) to show all currently running builds.
Don't want to iterate over all Projects or Plans to get this information...
I'd like to inform you that in next few weeks I am going to release my package on npm which exposes API with all builds information like what is currently building, what is in the queue, how looks recent builds etc.
In the first release frontend side (I will make something like wallboard) and backend will be in the one package, but in future I think that I will split package into two standalone repos: backend - api, frontend. Cross your fingers
I think this might be what you are looking for:
wget -q -O agent.txt --http-user=%LOGIN% --http-password=%PASSWORD% "http://localhost:8085/rest/api/latest/agent?os_authType=basic"
The output is json and shows what the agents are currently doing. In particular there is an element 'busy' that will be true or false for each agent:
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