REYAX LoRa Module RYLR999 Adds BLE Bridge for Fast Prototyping

REYAX RYLR999 BLE and LoRa Module

The REYAX LoRa Module (RYLR999) combines Bluetooth Low Energy (BLE) and LoRa into a single compact communication platform. Reyax Technology designed this module for engineers who want quick long-range wireless communication without writing firmware from scratch. Unlike traditional LoRa setups that need a microcontroller, this module can directly bridge a smartphone to a LoRa network using simple UART connections.

In a recent hands-on test, Electrotrio explored the real-world usability of this module. The review highlights a key idea: while you can build a similar setup using an ESP32 and a Semtech-based LoRa chip, the RYLR999 removes complexity. You just cross-connect UART pins, power the module, and start sending data. That simplicity targets rapid prototyping, field testing, and quick deployments where development time matters more than flexibility.

RYLR999 BLE LoRa module Pinout (Images used courtesy of Electrotrio)

REYAX RYLR999 BLE and LoRa Module Specifications:

• Wireless Connectivity:
  • BLE + LoRa dual-mode communication:
    • BLE: 2400–2483.5 MHz band
    • LoRa: 820–960 MHz configurable range
    • LoRa transmit power up to +30 dBm
    • BLE transmit power up to +20 dBm
    • LoRa sensitivity up to -133 dBm
    • BLE sensitivity -104.9 dBm @125 kbps
• Core Functionality:
  • Built-in BLE-to-LoRa transparent bridge
  • No firmware required for basic communication
  • AT command-based control over UART
  • Dual UART interfaces for BLE and LoRa
• Interface and Hardware:
  • 2x U.FL connectors for external antennas
  • Separate UART pins for BLE and LoRa
• Power and Electrical:
  • Operating voltage: 4.75V–5.25V (5V typical)
  • I/O voltage: 3.3V logic
  • LoRa TX current up to 950 mA
  • LoRa RX current ~15.5 mA
  • BLE TX current ~90 mA
  • Sleep current down to 18.2 µA
  • Sleep current down to 18.2 µA
• Software and Features:
  • Supports BLE GATT profile
  • OTA firmware update support (BLE)
  • Configurable via AT commands
  • Default UART: 115200
• Dimensions: 25 mm x 22 mm x 3 mm (for the RYLR999_NP variant)
• Weight: ~3.2 g
• Operating temperature: -40°C to +85°C (Operating)

RYLR999 Top and Bottom Side

The REYAX LoRa Module uses a straightforward AT command interface, which makes configuration simple but slightly rigid. You need to set parameters like device ID, network ID, frequency band, and RF settings before communication. Electrotrio used the REYAX COMPORT tool for quick setup, although any serial terminal works. BLE communication runs in transparent mode using standard GATT profiles, but practical use still feels clunky. Sending data from a phone requires manual command formatting through apps like nRF Connect, which limits usability for non-technical users. A custom mobile app solves this problem, but that adds development overhead.

RYLS135 Block Diagram

The REYAX LoRa Module does not follow typical retail distribution. You need to request a quotation directly from Reyax Technology or authorized distributors. Pricing usually depends on volume, but expect it to cost more than a basic ESP32 + LoRa combo due to its integrated design and dual wireless capability. This makes it a better fit for industrial prototypes, field tools, or compact embedded products rather than low-cost hobby builds.

Images used courtesy of Electrotrio and Reyax Technology.