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First, it doesn't look like you're calling subtree:add_le() correctly, because the first argument should be a protofield, but you're passing it a tvbrange.

Well, assuming you have a protofield defined as follows:

somefield = ProtoField.uint24("foo.somefield", "Some Field", base.DEC, nil, 0x0fffff)

Then you should just need to add it to the tree using:

subtree:add_le(somefield, buffer(79, 3))