3 Replies Latest reply on Dec 16, 2015 9:41 PM by henryubnt

    OTA: Too much data offsets error

      Hi fochc_2132071, MichaelF_56 and jota_1939431,

      Here is a new question. Sometimes I got "too much data offset" What is the limitation of the OTA image size?

      (Currently ours is about 24K bytes.)

       

      Thanks.

        • 1. Re: OTA: Too much data offsets error

          Here is the message looks like:

          Too much data offsets:24240 + 40 total:24286 len:20
          
          • 2. Re: OTA: Too much data offsets error

            Hello Henry,

             

            1.  Have you changed the OTA sample App?  It should work and never send too much data.

            2.  Your "Too much data..." message - We assume that this is from the Windows Console?

            3.  The OTA Image size depends on several things:

                 a.  For OTA to succeed you need enough storage space, both RAM and Non-Volatile.

                 b.  if you have 64K of EEPROM you need to reserve half of this memory for your image.

                 c.  OTA also depends on your available RAM.

            4.  The way OTA Upgrade works is:

                a. It sends the size of the image first and then starts sending bytes.

                b.  If the device receives more than the initial bytes that was sent to it, the device will not be able to store the extra bytes

            5.  So the answer to your question is not a straightforward answer.

             

            At 24K, you are probably exceeding the limit.

             

            Hope this helps

             

            JT

            • 3. Re: OTA: Too much data offsets error

              Hi @j.t,

              If I used the perrapp of WsOtaUpgrade in SDK 2.1.1. all works well. The problem came the OTA application in SDK 2.2.2. If I click "Start" one more time, it will 100% happened. There should be some problem about the Windows application in SDK 2.2.2

               

              BTW, the 24K OTA bin works well with WsOtaUpgrade in SDK 2.1.1.

               

              Thanks.