jpnorair

4 ms·

1.
by jpnorair 7y ago
The LoRaWAN authors copied a lot from WiFi, which seems kind of dumb, but this sort of thing happens a lot when there is no security expert in the room. In addition, they needed to address that physical access to endpoints is easy in IoT,
2.
by jpnorair 8y ago
No, it's usually much less for GNSS. The secret to low power GNSS is to find a way not to have the receiver on much of the time, but that's very possible. LTE has less flexibility in overhead energy, because there's overhea
3.
by jpnorair 8y ago
Excellent post -- a rarely understood truth. For low power wireless systems, still, though, the bulk of the energy is spent in TX and RX. But realistically the quiescent power drain still needs to be in the sub 5uW range to deliver long l
4.
by jpnorair 8y ago
That's a really hard problem to solve, which is why you don't see lots of solutions. DASH7 has been around for a few years, and it addresses the technical aspects of this problem, although it still probably needs another year to
5.
by jpnorair 8y ago
A few things. (1) If the payload is shorter than the key length (e.g. 128 bits) then crypto is actually really strong (and easy). For long payloads, you need to work a lot harder. (2) For doing a public key handshake, you can do it witho
6.
by jpnorair 11y ago
It is a feature of using lower frequencies together with lower data rates and signal processing technologies. Consult with any RF engineer -- there is no magic here, just practical engineering to solve a particular set of problems.
7.
by jpnorair 11y ago
The part of the article that addresses data interoperability and databasing on the endpoint (without cloud middleman) is important for use cases where there are ownership issues. The author would no-doubt agree that having to subscribe to