#ble

Speccing a Pet Tracker That Doesn't Need a Subscription

“Everyone ships always-on cellular because it's the obvious spec. It's also over-engineered for a pet that's home 95% of the time.”

Tractive Base Station teardown — 2025 silicon, 2013 arch

“Tractive's Base Station ships an nRF52840 — a Swiss-army-knife radio that supports BLE 5, LE Coded PHY for 4× range, Thread for mesh, Matter, and 802.15.4. They use it as a plain BLE advertising beacon. The hardware is 2025; the architecture is 2013. The vendor doesn't know how to use what they bought.”

BLE vs LoRa vs cellular — the connected-product decision matrix

“If your spec says real-time and your power budget says two AA batteries for a year, the spec is wrong.”

BLE presence detection — iBeacons, room by room

“Room-level presence isn't 'where is the phone.' It's 'is a human here right now.' That distinction is what makes an automation feel intentional instead of creepy — and it's also where the tech is shakiest.”

OTA firmware over Bluetooth — pushing the ROM through the phone

“A brick in the field is a support call, a warranty replacement, and a one-star review. We've shipped about a million units. The math on getting OTA wrong is not subtle — so the device assumes every transfer will be interrupted and every image might be hostile, and is only surprised when it isn't.”

Phone-as-gateway — the auth model for BLE-only devices

“Bonding gives you trust between two specific physical objects. OAuth gives you trust between a human and a cloud. The device touches neither directly — and the only thing standing in the gap is a phone you have no reason to trust.”

Designing a connected health device with BLE 4.2

“A BLE device with no WiFi is a phone-shaped product. Every connected feature pivots through the customer's iPhone, including the ones the customer never asked to participate in.”

FitBark — the pet activity-tracker market in 2015

“Two accelerometers on one dog for a week. They agree on the shape of every day and disagree on the size of it by a fifth — because they draw the line between 'resting' and 'active' in different places. The shape is the dog. The size is a setting.”

Tagg vs Whistle — cellular vs BLE pet-tracker philosophies

“Cellular tracker, $7.95 a month. BLE tracker, nothing a month. But the subscription isn't the real difference — the radio is. One keeps a cellular modem half-awake and dies in three days; the other sleeps until your dog walks past the house and lasts a week.”

Atom arrives — Whistle launches a dog fitness tracker

“Whistle is Fitbit for dogs. That's the easy comparison. The harder question is whether tracking activity actually tells you anything about a dog's health or whether it's just a number we like to look at.”

Bluetooth Low Energy 4.0 in the smart home — the protocol primer

“BLE solves one specific problem: a peripheral that runs for a year on a coin cell while still being discoverable by your phone. That constraint shapes everything else about the protocol.”