Payload:Ĭontains the actual data stored in bytes. ID of the record, mostly used for external applications to identify the message. This value corresponds to the TNF field in the header. The length of the payload field, again in the payload field the actual data is stored. Other information stored in the header record are MB (message begin), ME (message end), CF, SR, and IL. These are the possible values of the TNF field:Ģ -> Multipurpose Internet Mail Extension (MIME)ģ -> Absolute Uniform Resource Identifier (URI)Ħ -> Unchanged (when data in the payload field is too large, the data is chunked in multiple records) This field indicates the type of data in the payload (the actually transferred data). One of those is the Type Name Format (TNF). The header record contains important information about the message. The message contains multiple records: Header:
This message format can be used to read or write from a tag or when working with two active enabled NFC devices. The NDEF format is standardized by the NFC forum. There are also alternatives like MIFARE classic. These tags are the most common ones and are being supported by most of the enabled NFC devices. The NFC forum standardized five different tags, type 1, 2, 3, 4, 5. Also there are different tag technologies. The Android.Nfc namespace provides functionality to work with NFC. Think of two smartphones that are exchanging data. Two enabled NFC devices can communicate with each other.
Smart posters are widely used for marketing/advertisement purposes. Basically, smart posters can hold multiple tags. An enabled NFC device can also write data on a tag (Basically they are Target and Initiator). A tag can hold a small amount of data that can be read by a device. Read and write:Īn enabled NFC device can exchange data by using tags and smart posters. For instance, instead of a card for opening your hotel room, you could use your smartphone for opening the door. Physical cards are being replaced by NFC-enabled devices. There are three types of NFC modes: Card emulation: And also that is why NFC is widely chosen as the technology for contactless payments. NFC operates at a short distance because of security concerns. NFC connects and exchange data based on existing Radio Frequency Identification (RFID) standards. These standards are created by the NFC forum.
This technology was officially accepted in 2003 by the International Standards Organization. NFC Card Reader Example Using Xamarin.Android Xamarin - Near Field Communication
0 kommentar(er)
