[Bug] "network Error : EOF" immediately after finding multiple devices on "mqtt sync all" (Rate Limiting?)

[Alfystar]

Hello, I am running into a consistent EOF network error when trying to sync my Sungrow devices to my MQTT broker (Home Assistant). The login is successful, and the software correctly identifies my 5 devices, but it crashes instantly right after that step during mqtt sync all.

I suspect that iSolarCloud's firewall is forcefully dropping the connection (EOF) because the application is trying to fetch the data for all 5 devices simultaneously, triggering their anti-scraping/rate-limiting protections.

Environment:

• GoSungrow Version: 3.0.7
• Deployment: Docker (using 11notes/docker-sungrow image)
• Number of Devices: 5
• Command executed: GoSungrow mqtt sync all

Steps to Reproduce:

1. Configure GoSungrow with an iSolarCloud account containing multiple devices (e.g., 5).
2. Run GoSungrow mqtt sync all.
3. The software logs in successfully, saves the token, prints Found SunGrow 5 devices, and immediately throws Error: network Error : EOF.

Debug Logs:

type=INF msg=starting sungrow (3.0.7)
Email:  in***@******.it
Create Date:    Fri Nov 14 15:00:42 CST 2025
Login Last Date:    2026-04-29 19:02:35
Login Last IP:  
Login State:    1
User Account:   1234566
User Id:    98876544
User Name:  devName
Is Online:  false
2026/04/29 13:02:35 INFO: Connecting to MQTT HASSIO Service...
Token:  777946_[REDACTED_TOKEN]
2026/04/29 13:02:35 INFO: Connecting to SunGrow...
Token File: /sungrow/etc/.GoSungrow/AppService_login.json
2026/04/29 13:02:35 INFO: Found SunGrow 5 devices
Error: network Error : EOF

Proposed Solution / Feature Request:
If this is indeed caused by iSolarCloud's strict rate limiting on simultaneous API calls, would it be possible to introduce a --delay or --throttle flag? This would allow the sync all command to wait a few seconds between fetching each device, preventing the cloud provider from dropping the connection.

Thank you for your time and for this great project!