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The OSSM supports WiFi connectivity for over-the-air (OTA) firmware updates. This guide explains how to connect your OSSM to your home network and check for updates.

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WiFi setup

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Starting WiFi setup

1

Navigate to WiFi Setup

From the main menu, scroll to WiFi Setup and press the encoder to select it.
2

View connection instructions

The display shows:
  • “WiFi Setup” header
  • Instructions to connect to ‘OSSM Setup’
  • A QR code for quick connection
The QR code encodes: WIFI:S:OSSM Setup;T:nopass;;
3

Connect to the OSSM access point

On your phone or computer:
  1. Open WiFi settings
  2. Look for a network named OSSM Setup
  3. Connect (no password required)
Scan the QR code with your phone’s camera for one-tap connection on supported devices.
4

Configure your home network

After connecting to the OSSM access point:
  1. A captive portal should open automatically
  2. If not, open a browser and navigate to 192.168.4.1
  3. Select your home WiFi network from the list
  4. Enter your WiFi password
  5. Click Save
The OSSM will attempt to connect to your home network.
5

Exit WiFi setup

Press the encoder or select Restart to exit WiFi setup mode. The OSSM will restart and connect to your configured network.

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Verifying connection

After restarting, the OSSM will attempt to connect to your configured WiFi network. You can verify the connection by:
  1. Selecting Update from the main menu
  2. If WiFi is connected, you’ll see “Checking for update…”
  3. If WiFi is not connected, you’ll be redirected to WiFi setup
The OSSM doesn’t display its IP address on screen. For advanced networking, you can find it in your router’s DHCP client list or use network scanning tools.

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Clearing WiFi settings

To connect to a different network or troubleshoot connection issues:
  1. Select WiFi Setup from the menu
  2. The previous network configuration will be overwritten when you save new settings
  3. Alternatively, reflash the firmware to clear all settings

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Over-the-air updates

The OSSM can download and install firmware updates directly over WiFi, without connecting to a computer.

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Prerequisites

  • Active WiFi connection (configured via WiFi Setup)
  • Internet access from your network
  • Sufficient battery/power during the update process

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Checking for updates

1

Navigate to Update

From the main menu, scroll to Update and press the encoder.
2

Wait for version check

The display shows “Checking for update…” while the OSSM contacts the update server.The firmware sends its current version (SW_VERSION) to the server, which responds with whether an update is available.
3

Review result

You’ll see one of two screens:No update available:
  • “No Update Available” message
  • Press the encoder to return to the menu
Update available:
  • “Updating OSSM…” message
  • Update begins automatically

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During the update

Do not power off or disconnect your OSSM during an update. This can corrupt the firmware and require manual recovery.
The update process:
  1. Downloads the new firmware binary (~1-2 MB)
  2. Verifies the download integrity
  3. Writes the firmware to flash memory
  4. Restarts the device automatically
The display shows: “Update is in progress. This may take up to 60s.”

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After the update

The OSSM restarts automatically after a successful update. It will:
  1. Boot with the new firmware
  2. Perform the homing sequence
  3. Return to the main menu
Your settings and WiFi configuration are preserved across updates.

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Update channels

The OSSM firmware supports multiple update channels:
The update channel is determined at compile time. Production firmware checks the production server; development firmware checks the development server.

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Troubleshooting

  • Ensure you’re in WiFi Setup mode (screen shows QR code)
  • Move closer to the OSSM
  • Try refreshing your device’s WiFi list
  • Restart the OSSM and try again
  • Open a browser manually and navigate to 192.168.4.1
  • Disable mobile data on your phone temporarily
  • Try a different device
  • Verify your WiFi password is correct
  • Ensure your network is 2.4GHz (ESP32 doesn’t support 5GHz)
  • Check that your router allows new devices
  • Try moving the OSSM closer to your router
  • Verify WiFi is connected (try WiFi Setup first)
  • Check your internet connection
  • The update server may be temporarily unavailable
  • Try again in a few minutes
  • Ensure stable WiFi signal during update
  • Move closer to your router if needed
  • Verify your internet connection is working
  • Try again with a fresh power connection
This is rare but can happen if the update was interrupted. Recovery options:
  1. Try power cycling (unplug and replug power)
  2. If the device doesn’t boot, you’ll need to reflash via USB using PlatformIO

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Technical details

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Update server communication

The OSSM sends a POST request to the update server with:
The server responds with:
If needUpdate is true, the firmware downloads the binary from the firmware distribution server.

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Firmware binary locations

PlatformIO Setup

Manual firmware updates via USB for development or recovery.

BLE Protocol

Control your OSSM wirelessly via Bluetooth instead of WiFi.