Maker: Heltec

Microcontroller: nRF52840 Radio: SX1262

Bands: 433 MHz (410–525 MHz), 868 MHz (820–1020 MHz)

Firmware here: RNode firmware 1.86

An RNode: a LoRa radio for a computer or phone running Reticulum. The computer or phone sets the radio.

rnode_firmware_heltec_t114.zip 0.3 MB

SHA-256: 49a2d31841d5f7cc678a81d597e2c99b4400041f6ecf26f22ba922e670816a22

rnodeconf can flash and set up this board in one go without internet, if you give it the firmware and its release hash first. You need rnodeconf and adafruit-nrfutil from the Tools page. Linux and macOS:

mkdir -p ~/.config/rnodeconf/update/1.86

cp rnode_firmware_heltec_t114.zip ~/.config/rnodeconf/update/1.86/

echo "1.86 49a2d31841d5f7cc678a81d597e2c99b4400041f6ecf26f22ba922e670816a22" > ~/.config/rnodeconf/update/1.86/rnode_firmware_heltec_t114.zip.version

rnodeconf /dev/ttyACM0 --autoinstall --nocheck --fw-version 1.86

Windows (Command Prompt):

mkdir "%USERPROFILE%\.config\rnodeconf\update\1.86"

copy rnode_firmware_heltec_t114.zip "%USERPROFILE%\.config\rnodeconf\update\1.86"

echo 1.86 49a2d31841d5f7cc678a81d597e2c99b4400041f6ecf26f22ba922e670816a22> "%USERPROFILE%\.config\rnodeconf\update\1.86\rnode_firmware_heltec_t114.zip.version"

rnodeconf COM3 --autoinstall --nocheck --fw-version 1.86

It asks what the board is and which band, flashes it, then does the provisioning below for you. The rest of this section is for doing it by hand.

Do not unzip this one: the zip is the update package that adafruit-nrfutil sends to the board's bootloader. You need adafruit-nrfutil (Tools page).

adafruit-nrfutil dfu serial

--package rnode_firmware_heltec_t114.zip -p /dev/ttyACM0

-b 115200 -t 1200

On a Mac the port looks like /dev/cu.usbmodem1101.

If it says the board is not in DFU mode, double-tap the reset button (the reset button), check the port again (it can change) and run the command again.

Unzip adafruit-nrfutil--0.5.3.post17-win.zip (Tools page) into the folder that holds rnode_firmware_heltec_t114.zip, open Command Prompt there, then:

.\adafruit-nrfutil.exe dfu serial ^

--package rnode_firmware_heltec_t114.zip -p COM3 -b 115200 ^

-t 1200

Your port is in Device Manager under Ports (COM & LPT).

The firmware will not start its radio until the board's EEPROM holds what the board is (product, model, hardware revision) and the hash of the firmware you just flashed. How to flash explains why. With rnodeconf installed (Tools):

rnodeconf -k

rnodeconf /dev/ttyACM0 -r --product c2 --model c7 --hwrev 1

rnodeconf /dev/ttyACM0 -H eafc11ae1b198613b713ad10c565cf0423232c23a3e54250dfedbf41feea26c6

Model code by band: c6 for 433 MHz (410–525 MHz), c7 for 868 MHz (820–1020 MHz). Use the one for your board's band.

The first line makes a signing key; you only need it once on each computer. Skip the second line if the board has been set up before: the EEPROM survives a normal reflash. The third line is needed after every flash. Wait 5 seconds after it before you reset or unplug the board.

On Windows use the COM port instead, for example COM3.