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How the communication between two Ev-3 bricks is done over Bluetooth? What is the nature of data that can be communicated?

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Note that if you don't need wireless, the USB daisy-chain connection is a very convenient way to make several (up to 4 if I'm not mistaken) bricks work together - as you only need to create one program in which you can simply address all ports of all bricks. – Joubarc Oct 21 '13 at 17:17
It shouldn't be too much different from the NXT's Bluetooth capabilities, from what I perceive. – Timtech Oct 21 '13 at 22:00

You can do it using EV3 Bluetooth blocks. You can send integers, string or boolean using different "mailboxes" so the receiver just need to use the Block to read from a particular mailbox to get the data.

Maybe I write a post where I detail all this more because LEGO documentation isn't helpful at all.

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You can use the EV3 bluetooth blocks in the blue tab of the programming software.

One thing though: The two bricks have to have different names. Like "Kim" and "John".

Check the EV3 help too.

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