# Extending and API's

- [Gauges and Extensions](https://docs.spadnext.com/extending-and-apis/gauges-and-extensions.md): SPAD.neXt generally supports ESP compatible gauges
- [SPAD Gauges: GaugeSettings](https://docs.spadnext.com/extending-and-apis/gauges-and-extensions/spad-gauges-gaugesettings.md)
- [C# Scripting Interface](https://docs.spadnext.com/extending-and-apis/scripting-interface.md)
- [C# Scripting: ScriptStub](https://docs.spadnext.com/extending-and-apis/scripting-interface/c-scripting-scriptstub.md)
- [C# Scripting: Provide Values](https://docs.spadnext.com/extending-and-apis/scripting-interface/c-scripting-provide-values.md): Scripting reference implementation for providing Values to SPAD.neXt
- [C# Scripting: PreCompile](https://docs.spadnext.com/extending-and-apis/scripting-interface/c-scripting-precompile.md): Using precompiled Scripting Assemblies
- [Device Interface](https://docs.spadnext.com/extending-and-apis/serial-connection.md): SPAD.neXt device interface V2
- [Device Communication Flow](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow.md)
- [Device INIT-Phase](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-init-phase.md)
- [Device CONFIG-Phase](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase.md)
- [Device options](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase/device-options.md): Set device specific options
- [Device COLORSET configuration](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase/device-colorset-configuration.md): Defining a custom colorset for LED
- [Device PROFILE configuration](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase/device-profile-configuration.md): Device default profile configuration
- [Device OUTPUT Configuration](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase/device-output-configuration.md): Define a device output descriptor (SPAD -> Device)
- [Device INPUT configuration](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase/device-input-configuration.md): Define a device input (Device -> SPAD)
- [Device input AXIS](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase/device-input-configuration/device-input-axis.md): Define a device axis
- [Device input ENCODER](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase/device-input-configuration/device-input-encoder.md): Define a stateless encoder
- [Device input PUSHBUTTON](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase/device-input-configuration/device-input-pushbutton.md): Stateless push button
- [Device input ROTARY](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase/device-input-configuration/device-input-rotary.md): Define a stateful rotary switch
- [Device input SWITCH](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase/device-input-configuration/device-input-switch.md): Define a stateful device switch
- [Device input SWITCH3](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase/device-input-configuration/device-input-switch3.md): Define a stateful 3-Position (On1-Mid2-On0) switch
- [Device LABEL](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase/device-input-configuration/device-label.md)
- [Device config: Advanced topics](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-config-phase/device-config-advanced-topics.md): Add functionality to inputs and outputs
- [Device STATESCAN-Phase](https://docs.spadnext.com/extending-and-apis/serial-connection/device-communication-flow/device-statescan-phase.md)
- [Device General Commands](https://docs.spadnext.com/extending-and-apis/serial-connection/command-0.md): General Command ( SPAD.neXt <--> Device) on Channel 0
- [Device commands](https://docs.spadnext.com/extending-and-apis/serial-connection/command-1.md): The 1-Command is used by the device to send commands to SPAD.neXt.
- [Page-Control](https://docs.spadnext.com/extending-and-apis/serial-connection/command-1/page-control.md): Serial: Configuration (1) Page-Control
- [Device SPAD.neXt Events (2)](https://docs.spadnext.com/extending-and-apis/serial-connection/command-2.md): SPAD.neXt raises internal events on Channel 2
- [Device Simulation Events (Channel 4)](https://docs.spadnext.com/extending-and-apis/serial-connection/command-4.md)
- [Device Data (Channel 5)](https://docs.spadnext.com/extending-and-apis/serial-connection/device-data-channel-5.md)
- [Device LED Update (Channel 6)](https://docs.spadnext.com/extending-and-apis/serial-connection/device-led-update-channel-6.md): SPAD tells the device to change the status of a LED
- [Device Display Update (Channel 7)](https://docs.spadnext.com/extending-and-apis/serial-connection/device-display-update-channel-7.md): Update device display
- [Device Input Updates (Channel 8)](https://docs.spadnext.com/extending-and-apis/serial-connection/device-input-updates-channel-8.md)
- [Device Virtual Power](https://docs.spadnext.com/extending-and-apis/serial-connection/virtual-power.md): Virtual Power Support for serial devices
- [Device Custom UI](https://docs.spadnext.com/extending-and-apis/serial-connection/device-custom-ui.md): Providing a Custom UI for a device
- [Device HTML UI](https://docs.spadnext.com/extending-and-apis/serial-connection/device-html-ui.md): Providing a custom HTML UI for the device
- [Device preconfigured definition](https://docs.spadnext.com/extending-and-apis/serial-connection/device-preconfigured-definition.md)
- [Serial V2](https://docs.spadnext.com/extending-and-apis/serial-connection/serial-v2.md)
- [Command 1,RAISE](https://docs.spadnext.com/extending-and-apis/serial-connection/serial-v2/command-1-raise.md)
- [Command: 0,AUTH](https://docs.spadnext.com/extending-and-apis/serial-connection/serial-v2/command-0-auth.md): Request 3rd Party Authentication of the Device
- [X-Plane Datarefs & Commands](https://docs.spadnext.com/extending-and-apis/xplane-datarefs.md)
- [FSUIPC: Custom Offsets](https://docs.spadnext.com/extending-and-apis/fsuipc-custom-offsets.md): Adding custom offset to FSUIPC Data
- [RestAPI](https://docs.spadnext.com/extending-and-apis/restapi.md)
- [HTML Rendering API](https://docs.spadnext.com/extending-and-apis/html-rendering-api.md)
- [Other API's](https://docs.spadnext.com/extending-and-apis/other-apis.md)


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