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M24SR i2c communication protocol features

Question asked by mischuk.vadim on May 19, 2016
Latest reply on Jun 30, 2016 by JP Miller
I am currently developing NFC-powered device, based on Arduino and M24SR02 dynamic NFC tags. This library was chosen for establishing communication between Arduino and M24SR, and it works pretty fine with short NDEF messages. But I have noticed strange behavior, when reading  long NDEF messages. After reading ST documentation following questions appeared:
1) What is the purpose of DID field ?
2) Is it necessary to answer to S(WTX) ?
3) Who an when can send S(WTX) command?
Any help will be appreciated.