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LoraWan is super interesting for IOT but as far as I understand it acts more like a traditional radio transmitter? Great for collecting data from lots of discrete sensors but less for bi-directional data transfer

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It's bidirectional, that's the whole point. If it was unidirectional it would be no better than standard radio.

I think there's also a bi-directional mode for it.

Isn't one for LoRaWAN specifically, but there are other options like Weightless-W (which doesn't have any hardware released for it yet).

The FAQ says bi-directional:

http://www.semtech.com/wireless-rf/lora/LoRa-FAQs.pdf

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