SerenialTech develops Bluetooth Low Energy (BLE) apps for products that talk to a phone: smart locks, wireless earbuds, wearables, sensors, trackers and home devices. We design the GATT profile with your firmware team, build the pairing and reconnection logic, and make firmware updates over Bluetooth safe enough to run on thousands of devices in customers’ homes.
Bluetooth is the part of a connected product that customers notice most when it fails. A device that will not pair, forgets the phone after an update or drains its battery because the app polls too often quickly turns into returns and poor reviews. Our developers have solved these problems on shipped products, including automatic reconnection to remembered earbuds after the app restarts on both iOS and Android.
BLE work sits inside a wider connected-product picture — cloud sync, fleet dashboards, Wi-Fi provisioning and the enclosure itself. If your product needs more than the Bluetooth layer, our IoT app development service covers the complete app and cloud platform.
Who we work with
We work with hardware start-ups defining their first Bluetooth protocol, established device makers whose existing app struggles with connections, firmware teams that need a mobile partner who understands GATT and connection parameters, and companies certifying or redesigning a product who want the app ready on the same schedule. Some projects are the full companion app; others are focused Bluetooth fixes inside an app another team maintains.
Why choose SerenialTech for BLE App Development
We read the radio traffic, not just the logs
When a connection drops, we capture Bluetooth traffic, compare it with firmware logs and check how iOS and Android report each event. Finding the real cause — a connection parameter, a bonding issue, a race in the app — fixes the problem instead of hiding it behind retries.
Firmware and hardware colleagues
Our app developers work with electronics and firmware engineers every day. Questions about MTU size, advertising intervals, antenna placement in the enclosure or power consumption are answered in one conversation, not passed between suppliers.
Tested across real phones
Bluetooth behaviour varies between phone manufacturers and operating-system versions. We test on a range of iOS and Android devices, including older and budget models your customers actually own, and keep a record of the quirks we find.
Planning your BLE App Development project
Write the GATT profile down
Agree services, characteristics, data formats, units, error codes and version numbers in a shared document before implementation. A versioned profile lets app and firmware teams work in parallel and avoids silent mismatches after updates.
Decide on bonding and security
Choose how devices pair, whether they bond, how ownership is transferred and how commands are authenticated. For locks and other sensitive products, encryption and server-checked permissions are essential, not optional.
Budget for power and background limits
Phones restrict what apps can do in the background, and every connection costs battery on both sides. Decide which features must work with the app closed, and design notifications and reconnection around the limits of each platform.
Prepare test hardware early
Give the app team several production-like devices as soon as possible, plus a way to reset, re-flash and read logs from them. Testing on real hardware from the first sprint finds protocol and timing issues long before they reach customers.
Plan for factory and support tools
The same Bluetooth knowledge that powers the app can help production and support teams. Simple tools for factory testing, serial-number registration and remote diagnostics save time on the production line and make customer problems easier to solve.
Version the protocol and the app together
Devices in the field will run different firmware versions for years. Design the app to read the firmware version, support older versions sensibly and prompt users to update, so new app releases never break devices that customers already own.
Respect privacy and permissions
Bluetooth scanning can reveal a user’s location, so iOS and Android ask for specific permissions and explanations. Write clear permission messages, request access only when the feature is used and describe the data you collect in your store privacy labels, to avoid rejected releases and worried customers.