Lyra 24 Series Bluetooth 5.4 Solutions
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Lyra 24 Series - Bluetooth v5.3 PCB Module (20dBm) with integrated antenna (Silicon Labs EFR32BG24) - Tape / Reel


Lyra 24P (PCB Module)
Antenna Options
20dBm Integrated antenna
Dimension (Length - mm)
Dimension (Width - mm)
Dimension (Height - mm)
Antenna Type
Silicon Labs EFR32BG24
Up to 26 GPIO with output state retention and asynchronous interrupts
Output Power
Up to +20 dBm
Tape / Reel

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How can Lyra be configured for Regulatory testing if there is no UART access available?

Silicon Labs provides a Wireless Direct Test Mode (DTM) application that can programmed onto a Lyra module that allows for DTM commands to be completed wirelessly from another device such as a mobile phone using EFR Connect Mobile app.

There is an existing page (Implementing Wireless Direct Test Mode (DTM)) in the Silicon Labs Bluetooth Docs that explains operation and provides source to be added to a Simplicity Studio project. However, at the time of the writing of this FAQ the source is based on much older Simplicity Studio 4 and doesn’t build properly with Simplicity Studio 5. An updated Wireless DTM application is available on the following Silicon Labs GIT page and source provided will build using Simplicity Studio 5.

Bluetooth Wireless DTM

An application is created in Simplicity Studio IDE based on Bluetooth_soc_empty application. The existing app.c file is replaced with app.c provided from the src folder in Bluetooth Wireless DTM. GATT table configuration is also made available in the config folder in Bluetooth Wireless DTM.

With the Wireless DTM application loaded and programmed the Lyra module will begin advertising and show as dtm_test. 

Once connected to Lyra dtm_test you can see the GATT Services; DTM Control, DTM RX and DTM TX. Note the services will not be presented as shown below. You will need to determine each service based on UUID which is shown on Bluetooth Wireless DTM but also provided below for demonstration.

Expanding on the DTM Control Service the characteristics for that service can be observed. Each characteristic is written to configure the test as detailed at in Bluetooth Wireless DTM.

Further command and command argument information can be found on the Testing Commands page.

Can the Lyra 24 modules support Wirepas MESH?

Lyra 24 modules do support Wirepas 2.4GHz Mesh. Wirepas added support of the EFR32BG24 BLE MCU in v5.4.0 FW release:

Wirepas Mesh 2.4 GHz Firmware v5.4.0 for EFR32xG24 Release Notes: Wirepas Developer Portal

With the larger 256K RAM size on the EFR32BG24 BLE MCU used on Lyra 24, Wirepas Nodes can be configured for LE Mode and Low Latency Node (Sink/Router Modes).

For more details on Lyra P and Lyra S Wirepas solution refer to the following page:

Wirepas Partnership (


For information related to the Wirepas Mesh 2.4GHz FW v5.3.0 refer to the following Release Notes:

Wirepas Mesh 2.4 GHz Firmware v5.3.0 Release Notes: Wirepas Developer Portal


What is Laird Connectivity's product lifecycle EOL and PCN policy?

Laird Connectivity is committed to the long-term supply of all its standard embedded wireless modules and packaged products. Laird Connectivity’s products are specifically designed to meet the needs of the industrial and medical markets, which typically require 7 – 10 years product lifecycle. Although Laird Connectivity can’t guarantee that a component used in our products will not be obsoleted and cannot be reasonably substituted, Laird Connectivity can assure customers we will continue to sell our product when we have customer demand and can obtain the necessary components to build our products.

View our full policy here.