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In your handle_trigger_transition method, you have

if state == START.State:

but the variable state is not defined, you probably want to use self.state or req.state instead. You also use START.State instead of State.START and STATE.AT_LOC_2 instead of State.AT_LOC_2

There's a few times that State is written as STATE.

Also, it appears that in a few instances you're trying to access methods without using self . You should use self.<instance-method>() instead.