Option 1: Use your cs degree to get a job. Live cheaply, buy assets. You'll need financial assets to take advantage of opportunties that will present themselves later in life.
Option 2: Use your cs degree to start some tech thing. If it succeeds you can fund your coffee project; if it fails, your resume should be good enough to get a different cs job. In your hobby time play around with embedded software.
Option 3: Do your coffee thing, you will probably go broke and your resume will not have any programming experience on it. But if you really love it and you do 10x effort you might make it. It really depends on your risk tolerance and your safety net and support structure.
Option 2: Use your cs degree to start some tech thing. If it succeeds you can fund your coffee project; if it fails, your resume should be good enough to get a different cs job. In your hobby time play around with embedded software.
Option 3: Do your coffee thing, you will probably go broke and your resume will not have any programming experience on it. But if you really love it and you do 10x effort you might make it. It really depends on your risk tolerance and your safety net and support structure.