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XARI.IO
Case Study — Connected Hardware
The firmware behind awireless weapon-light remote.
HB Industries set out to cut the cable between a rifle-mounted light and its pressure-switch remote. Xari designed and built the firmware on both ends of the wireless link — and worked shoulder-to-shoulder with the hardware and mechanical team so the remote feels wired, without the wire.
Weapon light with the wireless tailcap, rail-mounted
01
Firmware on both ends
The tailcap on the light and the remote in hand both run Xari firmware.
02
Press. Light.
A button press reaches the light in a fraction of a blink — every time.
03
Built for a coin cell
Power management designed so the remote runs for months, not days.
The Role
We owned the firmware.
Xari led the firmware side of the product end to end — the code inside the tailcap that switches the light, the code inside the remote that talks to it, and the wireless link between them. We worked shoulder-to-shoulder with the hardware and mechanical team from the first schematic through board bring-up, so the result feels like one product, not two boards with a radio bolted on.
The Challenge
Replace a wire without anyone noticing.
A wired pressure switch has one job and does it instantly. Going wireless can't change that. The link had to be immediate, it had to hold up on a rifle in real conditions, and the two units had to find each other on their own after every power cycle — with the remote doing all of it on a single coin cell. And the light still had to work from its own switch, radio or no radio.
The Work
What Xari built.
Firmware for both units
One codebase serving the tailcap and the remote — from bench development kits all the way to the production boards.
Instant, dependable link
A wireless connection tuned for a wired feel — immediate response, and stable in the real world, not just on the bench.
Pair once, stay paired
The two units bond to each other, reconnect on their own after any power cycle, and ignore everyone else.
Months on a coin cell
Tiered power management that sleeps deep and wakes instantly — including wake-on-motion the moment the rifle is picked up.
Works with the physical switch
The light's own tailcap switch keeps working — on its own or alongside the remote — so nothing ever depends on the radio.
Hardware bring-up, together
Pin mapping, first power-on, and debugging on the real boards alongside the hardware and mechanical team — feeding what we learned straight back into the design.
The Product
Engineered to feel like one product.
The result is a weapon light that turns on when you press the remote — and that's all the user ever has to think about. The radio, the pairing, and the power management disappear into a tailcap that simply screws on.
Rail mount
Weapon light
Wireless tailcapRemoteWeapon lightFirmware on both endsOne connected system
The Hardware
Two small boards. One shared firmware.
Both units are built around the same Bluetooth Low Energy module, so a single firmware platform serves the whole system. The tailcap screws onto the light and switches it; the remote is one button in hand. Xari brought up both boards with the hardware and mechanical team, from first power-on to production.
“
A wireless remote has to feel wired. Press, light — every time. The firmware has to disappear to do that.— The Xari team
What Xari Does
Firmware and software for connected products.
Firmware development
Bluetooth LE & wireless connectivity
Low-power embedded design
Hardware bring-up & debug
Mobile & backend for connected devices
Engineering augmentation
Have a piece of connected hardware that needs firmware that just works? That's us.
Let's talk
Building connected hardware? Let's talk.
Xari partners with product companies to design and build the firmware and software behind connected hardware.
Get in touchHardware and mechanical design by HB Industries' engineering partners. Product imagery used with permission.
