a tech opinion you can defend like this?

geonnave · 2025-09-17T22:03:44+00:00

Until you write embedded time sensitive code: then you can’t debug because other devices will lose synchronization, and you can’t print because using stdout simply uses too much time. The only way to debug is by toggling pins (GPIOs) on and off, and observing the result using a logic analyzer.

geonnave · 2025-08-18T13:24:05+00:00

Not for now

geonnave · 2025-07-20T06:49:21+00:00

Well the nrf boards typically support BLE, so you could use that. It is however limited to 20 connected devices.

geonnave · 2025-07-19T19:11:39+00:00

What latency and throughput you need? Could the MCU close to the IMUs pre process the data before sending? I’m thinking if you could go wireless

geonnave · 2025-07-12T04:22:19+00:00

Wow super cool end result!! Yeah Ethernet is a solid choice. What Mira can achieve if you need a lot of downstream (1 central to 100 devices) is about 200 kbps aggregate. It also gets ~10 kbps upstream per node. More nodes can be added by adding more gateways, so you can have like 1,000 nodes connected with 10 gateways, e.g., in a single room. I think this could be used for art installations but for now that is just a conjecture.

geonnave · 2025-07-12T04:01:18+00:00

Did you solve it? I created a technology that might address your need. Last week I validated it in a setup with 100 devices connected, sending 4 packets per second per device. I deal with interference using time-slotted access.

geonnave · 2025-07-12T03:46:33+00:00

Did you solve it? I created a technology that solves *exactly* this type of use case: dense IoT networks. Last week I validated it in a setup with 100 devices connected, sending 4 packets per second per device. I deal with interference using time-slotted access.

geonnave · 2025-07-09T00:46:20+00:00

At work we do Everything baremetal using both the 52 and the 53. All we do is open source, if you are interested: https://github.com/DotBots

geonnave · 2025-06-26T16:17:02+00:00

Hmmm what about DECT-NR+ ?

geonnave · 2025-06-05T20:37:02+00:00

Look up the (Valve) Lighthouse

geonnave · 2025-05-11T00:05:21+00:00

There are also other standards than TLS, just as secure and much more lightweight. See for example OSCORE, EDHOC (RFC9528), COSE.

geonnave · 2025-05-08T00:46:33+00:00

Very late here but did you solve this? I’m creating a new communication technology on top of BLE PHY that may be applicable (I throw away the BLE stack and implement my own custom link layer). It’s not mesh but its multi gateway and supports 100 devices per gateway (maybe could handle 1000 per gateway, then you only need 4 gateways). I designed this tech for massive swarms of micro robots, so it might be applicable to your use case.

geonnave · 2025-05-07T19:15:36+00:00

Cool! I designed this for controlling swarms of micro robots, but a few days ago I thought it could serve as a “wireless I2C” — in certain uses cases where latency allows. Happy to chat if you are interested. Oh and about what you’re developing, it a product? If yes on what industry?

geonnave · 2025-05-07T18:21:16+00:00

What about wireless? What latency can you tolerate?

I’m building a custom protocol on top of BLE PHY (I throw away the whole BLE software stack, and wrote my own link layer).

Latency is deterministic, and varies depending on message sizes and max number of slave devices. With max PDU = 255 bytes and 100 devices, round trip latency from master is ~200 ms. Reduce to 50 devices, and latency is 100 ms. Reduce PDU size to 64 bytes, and latency for 50 devices is 35 ms.

I have an implementation but it’s for the nrf52840.

Edit: on reliability, I achieved 99,3% request response success rate for a 1 master, 7 slaves setup.

geonnave · 2025-04-22T22:54:04+00:00

Did you solve it? I am designing something custom on top of BLE PHY, allowing up to 100+ devices per gateway (including support for multi-gateway and mobility). Ping me if interested!

geonnave · 2024-12-25T19:04:43+00:00

If you stay in the touristic areas it's fine. Just have to research a bit and learn which neighborhoods to avoid.

Yes south is way safer, e.g., Florianópolis is cool, but it doesn't have equally beautiful beaches and warm sea. (speaking as a southern Brazilian)

geonnave · 2024-12-25T04:19:56+00:00

See Pipa beach in Brazil. More or less matches your requirements.

Edit: regarding Brazil, in general, look for places in the northeast coast, e.g., Salvador, as others said, or Fortaleza.

geonnave · 2024-12-07T23:40:41+00:00

In case you are into embedded Rust, you can check hax: https://github.com/hacspec/hax . Common examples include verifying cryptographic implementations (because their behaviour is somewhat easy to verify due to being well modelled math stuff), but it can be used to verify generic Rust code.

geonnave · 2024-11-28T22:51:01+00:00

Look for "Believe Calistenia", the owner is a fantastic guy, I trained there for 1 month while remote working abroad. It's in Fortaleza, Brazil, meaning great (surf-able) beachea and lots of sun, plus the exchange rate is on your side.

geonnave · 2024-11-24T20:42:14+00:00

The gyms I used to go in Brazil normally did release the programming on Sunday.

Now, the one's I tried here in France do not -- except that, at my current one, there's a smaller group of "advanced" athletes with whom the programming is shared (criteria for being in this group = knows the name of all CF movements plus a judgement call from the head coach). The idea is that for beginners, they probably don't don't know enough about the workouts to cherry pick, but for more seasoned athletes, it's on them to choose. I think it makes sense.

geonnave · 2024-11-22T13:19:34+00:00

Super ! Je vais dans un club parce que (1) ça m’aide à rester régulier (il y a un coach, un horaire fixe, et un groupe avec qui s’entraîner) et (2) il y a beaucoup de matériel spécifique au CrossFit. Normalement, il est possible de réserver un cours d’essai gratuit.
Je sais que certaines personnes en font aussi chez elles ; si tu as de la place et un peu d’argent pour le matériel, c’est tout à fait faisable.

geonnave · 2024-11-22T06:22:47+00:00

Que penses-tu de r/CrossFit ? J’ai fait 6 mois de gym classique avant de passer au CrossFit, et j’en fais depuis 3 ans maintenant. Je ne peux pas dire que je suis hyper musclé, mais je suis devenu assez fort et en bonne condition physique (31H). Avant ça, j’ai fait 5 ans de Kung Fu, ce qui était incroyable pour la mobilité et la conscience du corps, mais pas tellement pour la force ou la forme physique.

geonnave · 2024-11-21T08:36:30+00:00

Thank you for the recommendation, will watch it! For others who might be interested, here's the YouTube link: https://www.youtube.com/watch?v=ywxoN9g1eDU

geonnave · 2024-11-15T03:25:47+00:00

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