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Editorial Team
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Asked: 2026-06-12T13:32:27+00:00

While my routines sends and receive the data between Android device and PC without

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While my routines sends and receive the data between Android device and PC without any problems I have a strange issue.

All the messages I receive only on the Android side have two leading bytes that do not come from any of my data.

so when I send 01 02 03 as hex from the PC to Android device I receive “B1 60 01 20 03” this happens with all PCs or other devices – so it must be in my read routine somewhere – since other Android Apps that I tried do not receive the “B1 60” leading bytes.

This is how I read from USB:

lenOfPartialChunksBuffer = mDeviceConnection.bulkTransfer(
            mFTDIEndpointIN, bufferForPartialChunksOfAnswer, 4096,
            commMsg.timeoutForUSBBulkTransfer);

Anybody experienced something similar?

ps – no matter which device I connect to USB serial adapter – I keep getting these 2 extra bytes

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1 Answer

  1. Editorial Team

    I am a novice android programmer like yourself. What I can tell it might have something to do with your android phone/tablet. I recommend that if you can spare the two bytes in your protocol, just shift over the two bytes. That’s what I did and it worked fine.

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