Provide a target listing function

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This issue was created by revision r485.

Libnfc lacks of target listing function. Actually, applications or libraries 
based on libnfc have to wrote their own listing function which can provide side 
effect if two or more of theses libraries are used together in the same 
application. Plus, some kind of problem could appears during listing multiples 
targets (i.e. collisions) and this problem should be solved in libnfc (i.e. 
using NFC chip capabilities), not in applications based on libnfc.

Original issue reported on code.google.com by romu...@libnfc.org on 30 Jul 2010 at 1:27

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Original comment by romu...@libnfc.org on 30 Jul 2010 at 1:27

• Added labels: Type-Enhancement, Priority-High
• Removed labels: Type-Defect, Priority-Medium

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For the record, I add a note about ATQA collisions here.

When a PN53x chip list tags with colliding ATQAs, it sets this field to 0x0000 
before returning the tag information. As far as I could experiment on this, any 
tag which is not selected by the PN53x when a REQA command is send will reply 
with it's ATQA so since the PN53x cannot handle more than 2 tags 
simultaneously, collecting the ATQA of 3 tags with colliding ATQAs is not 
possible.

Original comment by romain.t...@gmail.com on 4 Aug 2010 at 5:57

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Fix status. It has not been accepted yet while some tests have been made by 
Romuald and I but with no success, and the previous comment should be a good 
reason to set the status to Feedback.

Original comment by romain.t...@gmail.com on 6 Aug 2010 at 9:29

• Changed state: Feedback

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Yeah Romain, I experiment the same issues during my tests... maybe we should 
give up about ATQA collision and clean up the code: my lastest test remains in 
comment and tag collision detection is not needed anymore. What do you think 
about that suggestion ?

Original comment by romu...@libnfc.org on 16 Aug 2010 at 4:09

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I definitivelly agree!  Please remove this.

Original comment by romain.t...@gmail.com on 16 Aug 2010 at 7:07

• Changed state: Accepted

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Done in r533.

Original comment by romu...@libnfc.org on 17 Aug 2010 at 10:12

• Changed state: Fixed