-------------------------------------USB TEXT Command----------------------
1. For get current volume level
  
   command = getvolume

   response = Current Volume: 18

2. for setvolume directly 
 
   command = setvolume**21
             (setvolume**volume)

   response = Volume set to: 19

3. for increment and decrement volume manually
  
  '+' command for increment
   response = Volume: 20
 
 
  '-' command for decrement
   response = Volume: 19

4. For play MP3 file stored in spiffs inside 'mp3' folder

   command = play**filename
             (play**1.mp3)

5. For delete MP3 files 
    
   command = delete**foldername**filename
             (delete**mp3**1.mp3) 
 
   response = Full path to delete: /mp3/1.mp3
              File deleted: /mp3/1.mp3

6. For delete JPEG files 

   command = delete**foldername**filename
             (delete**images**2.jpeg)

   response = Full path to delete: /images/2.jpeg
              File deleted: /images/2.jpeg

7. For get information about jpeg files stored in spiffs

   command = fileinfo
 
   response = 
{
    "images": [
        {
            "filename": "1.jpeg",
            "size": 94597
        },
        {
            "filename": "2.jpeg",
            "size": 20350
        },
        {
            "filename": "3.jpeg",
            "size": 61545
        },
        {
            "filename": "4.jpeg",
            "size": 86536
        }
    ],
    "totalBytes": 1799921,
    "usedBytes": 521578,
    "availableBytes": 1278343
}


8. For get information about mp3 files stored in spiffs

   command = fileinfomp3

   response = 
{
    "mp3files": [
        {
            "filename": "1.mp3",
            "size": 103016
        },
        {
            "filename": "2.mp3",
            "size": 149667
        }
    ],
    "totalBytes": 1799921,
    "usedBytes": 521578,
    "availableBytes": 1278343
}


8. For upload JPEG files in spiffs inside 'images' folder

    command = sending**1.jpeg**14114**1024
              (sending**filename**filesize**chunksize)

    response = "ok" after each chunk


9. For upload MP3 files in spiffs inside 'mp3' folder

    command = sendingaudio**1.mp3**14114**1024
              (sendingaudio**filename**filesize**chunksize)

    response = "ok" after each chunk


10. For start rotation 

   command = startrotation
   response = Command received. Starting rotation mode...


11. For stop rotation 

   command = stoprotation
   response = Rotation mode stopped.


12. For upload image in Ram/buffer and display 

   command =  startsendingfile welcome.jpeg 16771
            (startsendingfile filename.jpeg filesize)

  Response = Command received. Preparing to receive file...

  send image in chunk 

  final response = Image Displayed Successfully 


13. For upload mp3 file in Ram/buffer

  command =  startsendingaudio welcome.jpeg 16771
            (startsendingaudio filename.jpeg filesize)

  Response = Command received. Preparing to receive file...

  send image in chunk 

  final response = MP3 Data received successfully 


14. For Check available memory

   command = freesize
   response = 1278343 exit


15. For set timer in seconds

   command = settimer**seconds
             (settimer**2)

   response = New timer set to 2 seconds. exit



---------------------------- USB BIll responce json command   ------------------------------------------
COMMAND FOR SHOW SINGLE ITEM :
newbill**Cold Drink**ITM002**100.0**2**bottle**200.0**600.0
(newbill**itemname**itemcode**price**quantity**unit**total**grandtotal)


COMMAND FOR SHOW FULL BILL :
billjson**{"storeInfo":{"storeName":"Test Store","address":"123 Test Street","phone":"123-456-7890","gstin":"TEST123456"},"billInfo":{"billNo":"1","date":"2025-02-17","time":"12:00","cashier":"Test Cashier"},"customerInfo":{"customerName":"John Doe","customerPhone":"987-654-3210"},"items":[{"itemName":"Item 1","quantity":2,"pricePerUnit":10.0,"total":20.0},{"itemName":"Item 2","quantity":1,"pricePerUnit":15.0,"total":15.0},{"itemName":"Item 3","quantity":1,"pricePerUnit":15.0,"total":15.0}],"totals":{"subTotal":50.0,"tax":5.0,"discount":0.0,"totalAmount":55.0,"amountPaid":55.0,"paymentMethod":"Cash"},"footer":{"message":"Thank you for testing!","website":"www.teststore.com"}}


singlebillformat**1   --> for change sigle item theme bill 
newbill**<item data>  --> display bill in this theme

changejsontheme**1    --> for change json bill item theme 
billjson**<>


DisplayTotalScreen**2390.32**50**50**2390.32 
(DisplayTotalScreen**totalamount**discountamount**taxamount**grandtotal)