How to get the direction on the captured BLE data?
Using Hollong BLE Sniffer, captured following data, but do not know the data source (master or slave?), how to get?Last edited by vtguru on 2019-1-8 08:27
So far the source (of master or slave) is not identified in current software version of sniffer, it's under development.
To identify data is from master or slave, has to guess based on:
1. MTU Exchange request is definitely from master;
2. MTU Exchange response is from slave;
3. As the MTU request is 185 bytes (so it's BLE4.2 or above), but RSP (response ) is 23 bytes,so it is supposedly termination indication is issued by master.The data (4393) with control code LL_TERMINATE_IND is from master.
LL_TEMINICATION_IND could be issued by master or slave, but for above MTU request / response, it's reasonable to think this termination ind is from master.
Here is the link to introduce more about the procedure of BLE communication, after has basic understanding of BLE communication, it's much easier to identify the data resource.
https://books.google.com/books?id=3nCuDgAAQBAJ&pg=PA187&lpg=PA187&dq=LL_TERMINATE_IND+is+from+master+or+slave&source=bl&ots=rLW9wZy9rc&sig=7eAXCEJLj6du43sGfWlttY34e8k&hl=en&sa=X&ved=2ahUKEwjDoYbK9drfAhXiIDQIHTWnD-QQ6AEwBXoECAkQAQ#v=onepage&q=LL_TERMINATE_IND%20is%20from%20master%20or%20slave&f=false
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