IoT BLE Development Company

GATT (Generic Attribute Profile) is the protocol layer in BLE that defines how data is structured and exchanged between BLE devices. GATT organises data hierarchically: at the top level, a device exposes one or more Services (logical groupings of related data - e.g., a Heart Rate Service). Each Service contains Characteristics - the individual data items (e.g., Heart Rate Measurement characteristic, Body Sensor Location characteristic). Each Characteristic has a Value (the actual data bytes), Properties (whether it can be read, written, or subscribed to for notifications), and optionally Descriptors (metadata about the characteristic - its units, a human-readable name, or CCC for enabling/disabling notifications). When developing a custom BLE device, GATT profile design - choosing the service and characteristic structure, data formats, and access properties - is one of the most important early decisions, as it determines how mobile apps communicate with the device.

BLE range depends on transmit power, antenna design, RF environment, and BLE version. At 0 dBm transmit power with a typical PCB antenna, BLE achieves 10-30m in an office environment (walls, furniture, people reduce range). At 8 dBm (maximum allowed in India), 50-100m is achievable line-of-sight outdoors. BLE 5.0's Long Range (LE Coded PHY) extends range to 200-400m+ by trading data rate for sensitivity - 125 Kbps at -103 dBm sensitivity vs 1 Mbps at -96 dBm for standard BLE. Factors reducing range: walls (2.4 GHz penetrates poorly through concrete - 10-15 dB loss per wall), metal (significant absorption and reflection), human bodies between transmitter and receiver, and Wi-Fi interference on adjacent channels. For indoor deployments, always test actual range in the target environment rather than relying on theoretical calculations.

BLE indoor positioning determines a device's location inside a building using BLE signals - important because GPS does not work indoors. There are two main approaches: RSSI-based positioning uses the signal strength (RSSI) measured between a tag and multiple fixed reference points (beacons or anchors) to estimate distance, then uses trilateration or fingerprinting to determine position. Accuracy: 2-5 metres typical. BLE 5.1 Angle of Arrival (AoA) positioning uses an antenna array to measure the angle from which a BLE signal arrives, determining position from angle rather than signal strength. Accuracy: 0.5-1.5 metres with a well-designed antenna array and calibration. AoA requires specific hardware (Nordic nRF21540 or similar angle-capable BLE chips plus multi-element antenna arrays) but provides sub-metre accuracy that RSSI cannot reliably achieve.

iBeacon is Apple's BLE beacon standard, introduced in 2013. An iBeacon broadcasts a fixed advertisement containing a UUID (128-bit identifier for the beacon deployment), a Major number (16-bit, typically used for a location within the deployment - a floor in a building), and a Minor number (16-bit, typically used for a specific point within a location - a shelf in a store). The receiving app uses these identifiers to look up what to do at that beacon's location (in a configuration database the app maintains or fetches from a server). Eddystone is Google's open-source beacon standard with three frame types: Eddystone-UID (similar to iBeacon's UUID/Major/Minor), Eddystone-URL (broadcasts a URL that can be received by any phone's web browser via Physical Web, no app required), and Eddystone-TLM (telemetry - broadcasts battery level, temperature, and uptime for beacon health monitoring). Both iBeacon and Eddystone are supported by iOS and Android. iBeacon is more widely deployed; Eddystone-URL's app-free approach has not achieved mainstream adoption.

BLE Mesh is a networking standard (published by Bluetooth SIG in 2017) that allows BLE devices to form a multi-hop relay network, extending coverage beyond the 10-100m range of a single BLE connection. In a BLE mesh network, each node can relay messages from other nodes - a message originating from a sensor can be relayed by every intermediate node until it reaches the gateway or target device, covering an entire building with no single-hop range limitation. BLE Mesh uses a publish-subscribe model: devices publish messages to addresses (groups), and other devices subscribed to those addresses receive them. BLE Mesh is used for: large-venue lighting control (hundreds of lights in a warehouse or office, each a mesh node), building automation without wired infrastructure, and industrial site-wide sensor networks. The tradeoff: BLE Mesh increases power consumption (nodes must listen for relay traffic) - it is not suitable for coin-cell-powered sensors that need years of battery life. Nordic's proprietary Bluetooth mesh (nRF Mesh) and Silvair's commercial mesh are alternatives to the SIG standard.

The leading BLE system-on-chip (SoC) families: Nordic Semiconductor nRF52 series (nRF52832, nRF52840) - the industry standard for professional BLE development, used in most commercial wearables and IoT devices. nRF52840 adds USB support and Bluetooth 5.0 long range. Nordic nRF5340 for dual-core high-performance applications. Espressif ESP32 series (ESP32, ESP32-S3, ESP32-C3) - dual BLE + Wi-Fi on a single chip, popular for applications needing both protocols. Silicon Labs EFR32BG series - industrial-grade BLE with excellent -106 dBm receive sensitivity for extended range. Texas Instruments CC2650/CC2340 - established BLE chips with good toolchain support. Qualcomm QCC series for LE Audio and hearable applications. For new product development, Nordic nRF52840 or nRF52833 are the recommended choices for pure BLE, while ESP32-S3 is recommended for applications needing both BLE and Wi-Fi on one chip.

BLE OTA (Over-the-Air) firmware update is the capability to update the firmware running on a deployed BLE device by wirelessly transferring the new firmware to the device via a BLE connection from a smartphone or gateway - without physically connecting the device to a programmer or collecting it from the field. OTA is critical for any BLE device that will be deployed in large numbers or in locations where physical access is difficult: once deployed, firmware bugs can only be fixed via OTA; security vulnerabilities require OTA patches; and new features are delivered without recalling devices. A safe OTA implementation uses a dual-bank bootloader: new firmware is written to a secondary flash partition while the device runs the current firmware from the primary partition; only after the transfer is complete and the firmware image is validated (CRC check, signature verification) does the bootloader switch to the new firmware at next boot. If the new firmware fails to boot (detected by a watchdog), the bootloader falls back to the known-good previous firmware, preventing field devices from being permanently bricked.

BLE firmware development, iBeacon and Eddystone beacon development, BLE indoor positioning systems, BLE asset tracking, BLE gateway development, wearable BLE development, BLE mesh network development, and iOS and Android BLE SDK development.

Nordic Semiconductor nRF52810, nRF52832, and nRF52840 (primary - industry-leading BLE SoC family); Espressif ESP32-S3 and ESP32-C3 (dual BLE + Wi-Fi); Silicon Labs EFR32BG22 (industrial-grade high-sensitivity BLE).

2+ years on CR2032 coin cell for Nordic nRF52810 advertising once per 2 seconds at 0 dBm. 3+ years on CR2032 for devices advertising once per 5 seconds in low-power mode. 8 months on 400 mAh Li-Po for continuous sensing wearable applications with BLE connected.

Yes. iOS SDK using CoreBluetooth (Swift) with background BLE operation support, and Android SDK using the BluetoothGatt API (Kotlin) with foreground service for background BLE. Also React Native and Flutter cross-platform BLE plugins.

2-5 metres typical with RSSI fingerprinting and a well-calibrated beacon grid. Sub-metre (0.5-1.5m) accuracy with BLE 5.1 Angle of Arrival (AoA) using Nordic nRF21540 and compatible antenna arrays.