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The super “smart config with the Spark apps method doesn’t work (#EpicFail), I try it with two different Spark cores (with and without u.FL external antenna) with my Nexus 5 phone using Cyanogem, I got it:
$ screen /dev/cu.usbmodem1411
Now the core is connected but my serial connection with screen is frozen, I can’t kill it with [ctl]+[c] I think is a bug in the Spark core side.
Now I understand, when the Spark core is connected the serial connection is dropped, then:
Claiming the core: open up Spark Build and click the ‘Cores’ icon. Click the button that says ‘Add a Core’, and enter your ID in the text box.