@skinnylatte people literally will die where I live without AC. It's arguable whether we should be living here, but as long as we are, AC is a requirement. What's not required is keeping movie theaters in the low 60s. I hate that.
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The difference between it being really hot in SF and in Singapore is, it’s super hot in Singapore all the time so everywhere is built to accommodate that heat. -
"There can be at most one successful protocol for a given use case."@evan I slept in it and came up with another couple of examples. For more than two decades we had CDMA and GSM as differing protocols for cell phones in the US. For satellite positioning there's GPS and GLONASS (depending on how you want to define protocol since those are both one way signals)
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"There can be at most one successful protocol for a given use case."@evan yeah, they're both supported in hundreds of millions of devices worldwide. I've seen furnace filters with BLE. There's a huge market share for Zigbee in IoT/smart home and industrial applications. You'll find 2.4GHz propRF in electronic shelf labels, utility meters, and sensors among other use cases.
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"There can be at most one successful protocol for a given use case."@evan I'd say yes, for Wi-Fi your covering different PHYs for modulation and frequency, different error correction, and lots of other stuff. If a protocol is the set of rules that says how one device can talk to another then those differences necessitate a different protocol. In the case of the low power RF protocols, BLE vs Zigbee, those are definitely distinct from each other at multiple levels.
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"There can be at most one successful protocol for a given use case."@evan the entire series of 802.11 protocols? Depending on how narrowly you define your use case you could really home in on one. But if it's broadly defined, have your pick. I think my current wireless router supports four different protocols right now?
BLE (coded PHY), Zigbee and propRF protocols share plenty of overlap.