Talking to your device over BLE
Most modern hardware uses Bluetooth Low Energy (BLE), which works through GATT services and characteristics rather than a simple serial pipe. The app scans, connects, discovers the device's services, then reads, writes, or subscribes to notifications. Making that reliable — not just working once on your bench — is the real job.
We build against your device's actual GATT profile, or help define one if the firmware is still in progress.
- BLE scanning, pairing/bonding, and reconnect logic
- GATT service/characteristic read, write, and notify/indicate
- Classic Bluetooth (SPP) or BLE, matched to your hardware
- MTU negotiation and chunking for larger payloads
- Handling Android 12+ runtime Bluetooth permissions correctly
The messy real-world parts
Bluetooth demos look easy; production is where it gets hard. Devices go out of range, Android kills background connections to save battery, and different phone chipsets behave differently. An app that assumes a perfect connection will frustrate every user.
We design for the disconnects: automatic reconnection, honest connection-state in the UI, and safe handling of commands interrupted mid-transfer.
- Auto-reconnect and a connection-state UI the user can trust
- Background vs. foreground behavior within Android battery limits
- Queueing commands so a dropped link doesn't corrupt state
- Firmware (OTA/DFU) updates pushed from the app
- Testing across multiple phone models, not just one
Data, provisioning, and the cloud (only when you need it)
Many IoT apps do more than talk to one device — they provision Wi-Fi onto the device, log readings over time, or sync to a backend so data lives beyond the phone in hand.
We scope only what you need. A standalone tool that never touches the internet is a valid, cheaper answer; a fleet dashboard is a bigger build. We'll help you draw that line.
- Wi-Fi / network provisioning of the device through the app
- Local logging and charts for sensor data on the phone
- Optional cloud sync and remote monitoring
- Pairing and managing multiple devices in one app
- An iOS version later from a shared codebase, if you want both
More on android apps
Frequently asked questions
We have the hardware but no documentation for its Bluetooth interface. Can you still build the app?
Usually yes. If we can get the device's GATT profile or firmware source, that's fastest. If not, we can work it out by observing the connection, though that adds time. A short consultation lets us tell you which case you're in.
Does the app need internet, or can it work fully offline?
It can work fully offline if the device is self-contained — the phone talks directly to the hardware over Bluetooth with no server involved. Cloud sync is optional and only added when you need data off the device.
Can the same app also run on iPhone?
Yes. Bluetooth apps are a good fit for a cross-platform codebase (React Native or Flutter) so iOS and Android share most logic. The BLE stacks differ slightly per platform, so we test both on real devices.