docs: restore IKun focuser page

Author: Indigo2233

src/content/docs/focusers/ikun/ikun-focuser/ikun-focuser.md

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+---
+title: IKun Focuser
+categories: [focusers]
+description: INDI driver for EFucoser electronic focuser (ESP8266/Arduino Nano, ULN2003/STEP-DIR)
+thumbnail: ./ikun-focuser.webp
+---
+
+## Overview
+
+IKun Focuser is the native INDI driver for the open-hardware EFucoser electronic
+focuser controller. It supports the following hardware combinations:
+
+| Controller | Minimum Firmware | Motor Driver | Connection |
+|---|---|---|---|
+| ESP8266 | 1005 | STEP/DIR | USB serial, TCP |
+| ESP8266 | 1103 | ULN2003 | USB serial, TCP |
+| Arduino Nano | 1201 | ULN2003 | USB serial |
+
+## Features
+
+- Absolute and relative positioning
+- Abort and position synchronization
+- Configurable maximum travel
+- Direction reversal
+- Motor hold control
+- Temperature reporting (DS18B20)
+- Firmware and controller identification
+- Serial (9600-8-N-1) and raw TCP (port 4030) connections via INDI plugins
+
+## Installation
+
+When included in an INDI release, install the package containing INDI core
+drivers. To test before release:
+
+```bash
+indiserver -vv indi_ikun_focuser
+```
+
+## Connection
+
+### Serial
+1. Connect the controller via USB.
+2. Select the port in the Connection tab.
+3. Baud rate is fixed at 9600.
+
+### TCP (ESP8266 only)
+1. Connect to the controller's Wi-Fi AP (`Focuser-<chipid>`, password `012345678`).
+2. Select TCP, enter `192.168.4.1` and port `4030`.
+
+## Ekos Usage
+
+1. Add **IKun Focuser** to an Ekos profile.
+2. Open the control panel and select Serial or TCP.
+3. Configure max travel, speed, acceleration, reverse, and hold.
+4. Verify movement with small step counts before autofocus runs.
+
+## Troubleshooting
+
+**Connection fails:** Verify serial port / TCP address, firmware version, and
+`dialout` group membership.
+
+**Motor does not move:** Confirm external 12V power, shared ground, and correct
+firmware for your motor driver type. Reduce speed if stalling.
+
+**Position drift:** Enable Motor Hold. Toggle Reverse if direction is wrong.
+
+## Support
+
+Firmware, wiring, protocol, and issue tracking:
+[https://github.com/Indigo2233/EFocusor](https://github.com/Indigo2233/EFocusor)