Local Installer Panel & Wi-Fi Management

The Local Panel is a lightweight, responsive web application served directly by the converter’s embedded lwIP HTTP server. It enables field electricians and service technicians to commission the device without requiring specialized desktop configuration software.

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1. Commissioning via SoftAP Mode

When unconfigured or placed into setup mode (via service button), the converter broadcasts an encrypted Wi-Fi Access Point:

Parameter	Configuration
SSID	Aslandi-Converter-XXXX (where XXXX is the last 4 characters of MAC)
Security	WPA2-Personal (Pre-shared key printed on device hardware label)
Subnet	192.168.4.0/24 (DHCP pool 192.168.4.2 – 192.168.4.10)
Gateway Address	http://192.168.4.1/

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2. Web Interface Capabilities

flowchart TD
    Tech["Technician Smartphone / Tablet"] -->|"Connects to SoftAP"| AP["192.168.4.1"]
    
    subgraph LocalUI["Embedded Web Application"]
        Dashboard["Status Dashboard
(Live voltage, current, meter status, cloud connection)"]
        WiFiConfig["Wi-Fi Station Settings
(Target SSID, Password, DHCP vs Static IP)"]
        MeterScan["RS-485 Auto-Discovery
(Scans addresses 1–50, detects meter models)"]
        Diagnostics["Hardware Diagnostics
(RTC time, SD card status, LittleFS queue depth)"]
    end

    AP --> Dashboard
    AP --> WiFiConfig
    AP --> MeterScan
    AP --> Diagnostics

Core Web API Endpoints

All web UI actions invoke internal REST endpoints exposed by the FreeRTOS HTTP task:

Endpoint	Method	Purpose
/api/status	GET	Live telemetry, uptime, memory, Wi-Fi RSSI, and cloud connection state.
/api/config	GET / POST	Reads or updates network parameters, polling intervals, and cloud credentials.
/api/meters/scan	POST	Triggers a rapid bus scan across Modbus slave addresses (1–50) and reports discovered meters.
/api/meters/test	POST	Executes an immediate test read of a specific meter address and returns register values.
/api/time	GET / POST	Synchronizes the onboard RTC clock with browser local time or NTP server.

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3. Strict Network Isolation Policy

To maintain cybersecurity compliance, the local panel enforces strict operational rules:

1. Local Subnet Only: The web server binds exclusively to the local Wi-Fi interface (AP or dedicated local service VLAN). Direct routing from public WAN networks is prohibited.
2. Session Security: All administrative modifications require the authenticated installer PIN.
3. Automatic AP Timeout: If no client connects to the SoftAP within 15 minutes of device boot, the AP radio is automatically powered down to minimize RF exposure and power draw.