openCashBox() does not open cash drawer on iMin I24D03

[Doublelae]

Description

openCashBox() does not open the cash drawer on iMin I24D03 POS terminal. The method completes without error but the cash drawer does not physically open.

Steps to Reproduce

1. Run the imin_printer example app on iMin I24D03 device
2. Call initPrinter() then openCashBox()
3. Method returns successfully — no error thrown
4. Cash drawer does NOT open

Environment

• Device: iMin I24D03
• Flutter: 3.x
• imin_printer: 0.7.0 (also tested with latest git version)
• Android: Running on iMin POS terminal

What we tried

1. initPrinter() + openCashBox() — logs success, drawer stays closed
2. initPrinter() with timeout (5s) + openCashBox() — same result
3. Without initPrinter() — same result
4. Fresh IminPrinter() instance each call — same result

Expected Behavior

Cash drawer connected to the iMin I24D03 RJ12 port should physically open.

Actual Behavior

Method completes without error but cash drawer remains closed.

[iminsoftware]

打印机正常吗？调用api先确定，打印机是否正常或者提供下视频文件，以及具体的系统版本 ，测试调用的demo

[Doublelae]

Hi, I will create a testing app and share it with you soon. I will also provide a video, system version details, and demo for your verification. Thank you.