Most public wifi has client isolation enabled for this reason. Firewall or not, you can't communicate with other clients.

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craftkiller a day ago | parent [-]

Only if they're set up properly, which is quite the gamble. I was recently in a hotel and I listed all the chromecast devices throughout the entire hotel. I could see what everyone was watching and if I was a lesser person I could have controlled their TVs or changed what they were watching.

	▲	icedchai a day ago \| parent [-]
		What about device like those Chromecasts which don't even have firewalls? The only real solution would be to bring your own hardware firewall / access point and connect it as a client off the hotel wifi. Who is really going to do that?