Seeed XIAO nRF52840 + Wio-SX1262 Kit

⚠️ Check that radio.rxgain(on) and flood.advert.base (0.308) are set correctly after flashing! ⚠️

This build is based on official MeshCore 1.15.0 dev branch (as of 25-May-2026 and additionally includes the following unmerged upstream PRs/changes:

• PR2553: Limit flood advert packet forwarding --> set flood.advert.base 0...1 (0: no flood adv. forwarding, 0.308: default, 1: all flood adv. forwarding)
• PR1810: Allow direct message paths when denyf * is set
• :new: PR1727: Use hardware channel activity detection for checking interference --> Use set int.thresh 1 to activate hw based channel activity detection.
• :new: PR2377: Disable NRF52 undervoltage bootlock feature

Additional changes:

• Flood adverts are disabled (flood.advert.interval set to 0) by default
• :new: modified PR1810 to not block flood adverts but only PAYLOADTYPEGRPTXT and PAYLOADTYPEGRPDATA so that some limited flood advert distribution can be managed via PR2553 to support e.g. observer maps.

Changelog:

• Based on dev v1.15.0 as of 25-May-2026

Full Changelog: https://github.com/mattzzw/MeshCore-Evo/compare/v1.15.0-evo0.1.20...v1.15.0-evo0.1.21

Based on MeshCore v1.15 plus the below features:

Developed by IoTThinks and tested by our supportive friends and MeshCore community. Current Contribution to Meshcore: By IoTThinks%20is%3Apr%20author%3A%40IoTThinks). You may feedback there to get them merged faster to MeshCore main stream. If you want us to compile for your boards or have question, please comment in GITHUB or DISCORD

Updates:
15 May 2026: PS v15.0.2: Fixed boot loop due to flash mode for Xiao C6
10 May 2026: PS v15.0.2: Fixed FEM Off version for T096 BLE companions. The external LNA was fixed to off properly to reach -115 dbm noise floor.
04 May 2026: [BLE Companions for ESP32] PS v15.0.1: Skipped sleep when BLE read is busy and reduced sleep period from 50ms to 10ms.
27 April 2026: [Heltec v4 repeaters and room servers] PS v15.0.1: Applied latest changes in https://github.com/meshcore-dev/MeshCore/pull/2140. Fixed missing get radio.fem.rxgrain and not persisted radio.fem.rxgrain accross reboots.

Support Us

Enjoying our work? Support us via  or .

STAR Features:

• ESP32 BLE Companions: Officially support PowerSaving for ALL ESP32/S3/C3 BLE Companions. Fast loading of channels and contacts. Fixed hibernation mode for Heltec v3 and v4. ESP32C6 (including Xiao C6) is not supported yet.

| Board | Power Consumption | | ------------- | ------------- | | Heltec v3 | 100 mA => 19.6 mA | | Heltec v4.2 and v4.3 (FEM ON) | 120mA => 24.9mA | | Heltec v4.3 (FEM Off) | 120mA => 18mA | | Xiao S3 | 7x mA => 16.3 mA | | Xiao C3 | 7xmA => 15.1mA |

• [BETA] Repeater and room servers: No time drift by applying a time adjustment offset during "powersaving on"

Power Saving:

Latest Power Saving to Repeater, Room Server and BLE Companion. One 3000mAh battery can last an ESP32 repeaters, room servers and BLE companions for a week.

| Role | NRF52 | ESP32 | CLI Commands |
| ------------- | ------------- | ------------- | ------------- |
| Repeater / Room Server | 8mA => 5.8mA | 50+mA => 10-13mA | powersaving on, powersaving off, powersaving |
| BLE Companion | 12mA => 5.8mA | 120mA => 15-20mA | Enabled by default |

Extra Features:

Merged to add CLI control to LoRa's FEM LNA: https://github.com/meshcore-dev/MeshCore/pull/2140. CLI: set radio.fem.rxgrain on/off and get radio.fem.rxgrain Added CLI "powerlog" to list the last reset reason, last shutdown reason (NRF52 only) and last boot voltage (NRF52 only). This is to help debugging why the boards were reset due to software fault or low voltage (brownout). Included sensor CLI to list I2C and UART GPIOs: sensor Merged to keep date after crash/watchdog/brownout reset on ESP32: https://github.com/meshcore-dev/MeshCore/pull/1896 Automatically selected I2C address 0x76 and 0x77 for BME280/BME680/BMP280 Added i2c probe for sensors to start only in-use sensors. Added variant Xiao S3 (non-Wio) and Wio SX1262 (Initial support): SDA=D6, SCL=D7 https://github.com/meshcore-dev/MeshCore/pull/2383

Instruction:

Please upgrade your easy to access devices first. Download: Download upgrade.bin to upgrade existing devices or freshInstall-merged.bin for new devices. Instruction to Flash Custom Firmware. Please read the instruction in Add sensors to repeaters Source code for PowerSaving 15

Demo

Power Saving

Enter powersaving mode (CLI > powersaving on), 5.5mA for Heltec v4.3 with FEM and rxgain off, 5.8mA if FEM off and rxgain on. 13mA for Heltec v4.2 or Heltec V4.3 with FEM and rxgain on. 5.0mA for RAK4631

<img height="384" alt="image" src="https://github.com/user-attachments/assets/be6e298d-4931-4e83-8220-0d072f8aeefd" />
<img height="384" alt="image" src="https://github.com/user-attachments/assets/924aa3a5-64d0-4112-aa66-6ff72178d3ac" />
<img height="384" alt="image" src="https://github.com/user-attachments/assets/903d899d-66c4-4d88-bf61-e9601797009f" />

Default PowerSaving for ESP32 companion BLE. Reduced from 120mA down to 15-25mA.
<img height="384" alt="image" src="https://github.com/user-attachments/assets/bcae8449-4646-4a98-852f-312582686ad6" />
<img height="384" alt="image" src="https://github.com/user-attachments/assets/2fc5bee1-fe89-4c8f-8097-2db181d89f4a" />
<img height="384" alt="image" src="https://github.com/user-attachments/assets/656fcd90-3211-4044-832b-a63f30c2fb4a" />
<img height="384" alt="image" src="https://github.com/user-attachments/assets/7611ebb5-d2d1-42b7-8845-6016e838b0cf" />

PowerLog CLI

Enter CLI "powerlog" to see last reset/shutdown reason and the battery voltage during last boot. <img height="384" alt="image" src="https://github.com/user-attachments/assets/79a31bf6-a0c2-46d3-bf7e-d63ca27e3014" /> <img height="384" alt="image" src="https://github.com/user-attachments/assets/1870c4e7-5942-466e-af0c-66e7567c7aae" />

Sensor CLI

• Enter CLI "sensor" to check I2C and GPS Serial pins

<img height="384" alt="image" src="https://github.com/user-attachments/assets/060dd847-5984-4dc2-a5fe-cfe81180dc6c" /> <img height="384" alt="image" src="https://github.com/user-attachments/assets/49f25de7-a122-480f-a54a-a7176ec25f26" />

Based on MeshCore v1.15 plus the below features:

Developed by IoTThinks and tested by our supportive friends and MeshCore community. Current Contribution to Meshcore: By IoTThinks%20is%3Apr%20author%3A%40IoTThinks). You may feedback there to get them merged faster to MeshCore main stream. If you want us to compile for your boards or have question, please comment in GITHUB or DISCORD

Updates:
15 May 2026: PS v15.0.2: Fixed boot loop due to flash mode for Xiao C6
10 May 2026: PS v15.0.2: Fixed FEM Off version for T096 BLE companions. The external LNA was fixed to off properly to reach -115 dbm noise floor.
04 May 2026: [BLE Companions for ESP32] PS v15.0.1: Skipped sleep when BLE read is busy and reduced sleep period from 50ms to 10ms.
27 April 2026: [Heltec v4 repeaters and room servers] PS v15.0.1: Applied latest changes in https://github.com/meshcore-dev/MeshCore/pull/2140. Fixed missing get radio.fem.rxgrain and not persisted radio.fem.rxgrain accross reboots.

Support Us

Enjoying our work? Support us via  or .

STAR Features:

• ESP32 BLE Companions: Officially support PowerSaving for ALL ESP32/S3/C3 BLE Companions. Fast loading of channels and contacts. Fixed hibernation mode for Heltec v3 and v4. ESP32C6 (including Xiao C6) is not supported yet.

| Board | Power Consumption | | ------------- | ------------- | | Heltec v3 | 100 mA => 19.6 mA | | Heltec v4.2 and v4.3 (FEM ON) | 120mA => 24.9mA | | Heltec v4.3 (FEM Off) | 120mA => 18mA | | Xiao S3 | 7x mA => 16.3 mA | | Xiao C3 | 7xmA => 15.1mA |

• [BETA] Repeater and room servers: No time drift by applying a time adjustment offset during "powersaving on"

Power Saving:

Latest Power Saving to Repeater, Room Server and BLE Companion. One 3000mAh battery can last an ESP32 repeaters, room servers and BLE companions for a week.

| Role | NRF52 | ESP32 | CLI Commands |
| ------------- | ------------- | ------------- | ------------- |
| Repeater / Room Server | 8mA => 5.8mA | 50+mA => 10-13mA | powersaving on, powersaving off, powersaving |
| BLE Companion | 12mA => 5.8mA | 120mA => 15-20mA | Enabled by default |

Extra Features:

Merged to add CLI control to LoRa's FEM LNA: https://github.com/meshcore-dev/MeshCore/pull/2140. CLI: set radio.fem.rxgrain on/off and get radio.fem.rxgrain Added CLI "powerlog" to list the last reset reason, last shutdown reason (NRF52 only) and last boot voltage (NRF52 only). This is to help debugging why the boards were reset due to software fault or low voltage (brownout). Included sensor CLI to list I2C and UART GPIOs: sensor Merged to keep date after crash/watchdog/brownout reset on ESP32: https://github.com/meshcore-dev/MeshCore/pull/1896 Automatically selected I2C address 0x76 and 0x77 for BME280/BME680/BMP280 Added i2c probe for sensors to start only in-use sensors. Added variant Xiao S3 (non-Wio) and Wio SX1262 (Initial support): SDA=D6, SCL=D7 https://github.com/meshcore-dev/MeshCore/pull/2383

Instruction:

Please upgrade your easy to access devices first. Download: Download upgrade.bin to upgrade existing devices or freshInstall-merged.bin for new devices. Instruction to Flash Custom Firmware. Please read the instruction in Add sensors to repeaters Source code for PowerSaving 15

Demo

Power Saving

Enter powersaving mode (CLI > powersaving on), 5.5mA for Heltec v4.3 with FEM and rxgain off, 5.8mA if FEM off and rxgain on. 13mA for Heltec v4.2 or Heltec V4.3 with FEM and rxgain on. 5.0mA for RAK4631

<img height="384" alt="image" src="https://github.com/user-attachments/assets/be6e298d-4931-4e83-8220-0d072f8aeefd" />
<img height="384" alt="image" src="https://github.com/user-attachments/assets/924aa3a5-64d0-4112-aa66-6ff72178d3ac" />
<img height="384" alt="image" src="https://github.com/user-attachments/assets/903d899d-66c4-4d88-bf61-e9601797009f" />

Default PowerSaving for ESP32 companion BLE. Reduced from 120mA down to 15-25mA.
<img height="384" alt="image" src="https://github.com/user-attachments/assets/bcae8449-4646-4a98-852f-312582686ad6" />
<img height="384" alt="image" src="https://github.com/user-attachments/assets/2fc5bee1-fe89-4c8f-8097-2db181d89f4a" />
<img height="384" alt="image" src="https://github.com/user-attachments/assets/656fcd90-3211-4044-832b-a63f30c2fb4a" />
<img height="384" alt="image" src="https://github.com/user-attachments/assets/7611ebb5-d2d1-42b7-8845-6016e838b0cf" />

PowerLog CLI

Enter CLI "powerlog" to see last reset/shutdown reason and the battery voltage during last boot. <img height="384" alt="image" src="https://github.com/user-attachments/assets/79a31bf6-a0c2-46d3-bf7e-d63ca27e3014" /> <img height="384" alt="image" src="https://github.com/user-attachments/assets/1870c4e7-5942-466e-af0c-66e7567c7aae" />

Sensor CLI

• Enter CLI "sensor" to check I2C and GPS Serial pins

<img height="384" alt="image" src="https://github.com/user-attachments/assets/060dd847-5984-4dc2-a5fe-cfe81180dc6c" /> <img height="384" alt="image" src="https://github.com/user-attachments/assets/49f25de7-a122-480f-a54a-a7176ec25f26" />

Based on MeshCore v1.14.1 plus the below features:

16 April 2026 -v14.1.1: Disabled NRF52POWERMANAGEMENT for RAK4631, RAK3401, Heltec T114, Xiao NRF52, Senscap Solar and Ga56230s meshkit and Ga56230s mesh tracker pro. 10 Arpril 2026 - v14.1.1: [BETA] Added Power saving for Heltec v3, v4.2 and v4.3 companion BLE. Reduced from 120mA down to 32mA for Heltec v3 and 39mA for Heltec v4. LNA and FEM LNA use default settings (E.g On). 09 April 2026 - v14.1.1: Fixed reset issue in high traffic locations for ESP32-based repeaters and room servers.

NEW FEATURES:

Added Heltec v4.3 support: https://github.com/meshcore-dev/MeshCore/pull/1867. The PR will automatically detect Heltec v4.2 and v4.3. Added CLI control to LoRa's FEM LNA: https://github.com/meshcore-dev/MeshCore/pull/2140. Heltec T090 is not included. The details are below. Added CLI "powerlog" to list the last reset reason, last shutdown reason (NRF52 only) and last boot voltage (NRF52 only). This is to help debugging why the boards were reset due to software fault or low voltage (brownout).

FEM LNA vs. Chip LNA:
FEM LNA is external LNA from the 1W boards (such as Heltec v4.3). You can on / off this FEM LNA: set/get radio.fem.rxgain on/off. This will impact the RX gain and power consumption (up to 7.8mA). When this is off, Heltec v4.3 can reach 5.8mA. For Heltec v4.2, this CLI will return "Not supported" as it does not support FEM control.
Chip LNA inside SX1262: This is available to all boards including 1W boards. You can on/off this LNA : set/get radio.rxgain on/off. This will impact the RX gain and power consumption (up to 0.5mA)

Repeaters and Room Servers:

Included latest PowerSaving and PowerSaving CLI (powersaving, powersaving on and powersaving off): 5.0mA for NRF52, 10mA for Heltec v3, 13mA for Heltec v4.2 and 5.5 mA for Heltec v4.3 (with FEM off). https://github.com/meshcore-dev/MeshCore/pull/1687

#### Companions:
[NRF52] PowerSaving by default. Reduced from 9mA down to 5.8mA. https://github.com/meshcore-dev/MeshCore/pull/2286
[BETA] [ESP32] PowerSaving by default for Heltec v3 and v4. Reduced from 120mA down to 32mA for Heltec v3 and 39mA for Heltec v4.2 and 4.3.

Common features

Included sensor CLI to list I2C and UART GPIOs: sensor Kept date after crash/watchdog/brownout reset on ESP32: https://github.com/meshcore-dev/MeshCore/pull/1896 Automatically selected I2C address 0x76 and 0x77 for BME280/BME680/BMP280 Added i2c probe for sensors to start only in-use sensors: https://github.com/meshcore-dev/MeshCore/pull/1282 Added variant Xiao S3 (non-Wio) and Wio SX1262 (Initial support): SDA=D6, SCL=D7

Instruction:

Please upgrade your easy to access devices first. Download: Download upgrade.bin to upgrade existing devices or freshInstall-merged.bin for new devices. Instruction to Flash Custom Firmware. Please read the instruction in Add sensors to repeaters Source code for PowerSaving 14

Demo

Power Saving

Enter powersaving mode (CLI > powersaving on), 5.5mA for Heltec v4.3 with FEM and rxgain off, 5.8mA if FEM off and rxgain on. Thanks Wireless Rocks for your testing, . 13mA for Heltec v4.2 or Heltec V4.3 with FEM and rxgain on. 5.0mA for RAK4631

<img height="384" alt="image" src="https://github.com/user-attachments/assets/be6e298d-4931-4e83-8220-0d072f8aeefd" />
<img height="384" alt="image" src="https://github.com/user-attachments/assets/924aa3a5-64d0-4112-aa66-6ff72178d3ac" />
<img height="384" alt="image" src="https://github.com/user-attachments/assets/903d899d-66c4-4d88-bf61-e9601797009f" />

Default PowerSaving for Heltec v3, v4.2 and v4.3 companion BLE. Reduced from 120mA down to 32mA for Heltec v3 and 39mA for Heltec v4.
<img height="384" alt="image" src="https://github.com/user-attachments/assets/73689821-61cc-4c3e-833f-1511632b71df" />
<img height="384" alt="image" src="https://github.com/user-attachments/assets/f9161bf7-8a95-4e7d-b26a-7a6cbe88a615" />

PowerLog CLI

Enter CLI "powerlog" to see last reset/shutdown reason and the battery voltage during last boot. <img height="384" alt="image" src="https://github.com/user-attachments/assets/79a31bf6-a0c2-46d3-bf7e-d63ca27e3014" /> <img height="384" alt="image" src="https://github.com/user-attachments/assets/1870c4e7-5942-466e-af0c-66e7567c7aae" />

Sensor CLI

Enter CLI "sensor" to check I2C and GPS Serial pins <img height="384" alt="image" src="https://github.com/user-attachments/assets/060dd847-5984-4dc2-a5fe-cfe81180dc6c" /> <img height="384" alt="image" src="https://github.com/user-attachments/assets/49f25de7-a122-480f-a54a-a7176ec25f26" />

Support and Discussion

If you want us to compile for your boards or have question, please comment in GITHUB or DISCORD

Love the build?

• You may buy us a cofee ☕ for good work via Paypal  or Github .

We can buy more test boards and test sensors for development. Enjoy MeshCore. 👯‍♂️

Full Changelog: https://github.com/MichTronics/MeshCoreNG/compare/bridge-tcp-v1.0.5...repeater-v1.0.1

Full Changelog: https://github.com/MichTronics/MeshCoreNG/compare/bridge-tcp-v1.0.5...companion-v1.0.1

Full Changelog: https://github.com/MichTronics/MeshCoreNG/compare/bridge-tcp-v1.0.5...companion-v1.0.1

Full Changelog: https://github.com/MichTronics/MeshCoreNG/compare/bridge-tcp-v1.0.5...room-server-v1.0.1