Are there any way to show and send NDEF message in Android?

[socialismbuilder]

I want to communicate with android by pn532.

I'm sure I've successfully sent NDEF messages using SNEP protocol, because my mobile phone has sensed  response. And when I send a URL, my phone can open the web page。

But I don't know how to send NDEF message to PN532, and how to read all kind of NDEF messages using Android

and I can't communicate with nfc taginfo this app, It will have problems with LLCP protocol, although it seems support NDEF.

Are there any apps to  show and send NDEF message in Android?

[Kan_Li]

Hello @socialismbuilder ,

For Android NFC application, there is a UM on this topic, please kindly refer to https://www.nxp.com/docs/en/user-guide/UM10989.pdf for details.

Hope that helps,

Have a great day,
Kan

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[socialismbuilder]

here is a small part of programs of my project, to show my train of thought.

char b[] = "http://www.googlle.com";

NM_addUriRecord(ndef,(u8*)b,sizeof(b));
uint16_t messageSize = NM_getEncodedSize(ndef);
NM_encode(ndef,ndefBuf);

for(;;)
{
u8 a = snep.write(ndefBuf,messageSize,60000);
delay_ms(2000);
}

int16_t SNEP_write(const uint8_t *buf, uint8_t len, uint16_t timeout)
{
debug("\r\nSNEP active");
if (0 >= snep.llcp->activate(timeout)) {
debug("\r\nSnep failed to activate PN532 as a target\r\n");
return -1;
}
debug("\r\nSnep successed to activate PN532 as a target\r\n");

if (0 >= snep.llcp->connect(timeout)) {
debug("\r\nSnep failed to set up a connection\r\n");
return -2;
}
debug("\r\nSNEP successed to set up a connection\r\n");

// response a success SNEP message
snep.headerBuf[0] = SNEP_DEFAULT_VERSION;
snep.headerBuf[1] = SNEP_REQUEST_PUT;
snep.headerBuf[2] = 0;
snep.headerBuf[3] = 0;
snep.headerBuf[4] = 0;
snep.headerBuf[5] = len;
if (0 >= snep.llcp->write(snep.headerBuf, 6, buf, len)) {
debug("\r\nsnep write failed\r\n");
return -3;
}
debug("\r\nsnep write successed\r\n");

uint8_t rbuf[16];
if (6 > snep.llcp->read(rbuf, sizeof(rbuf))) {
debug("\r\nsnep read failed\r\n");
return -4;
}

// check SNEP version
if (SNEP_DEFAULT_VERSION != rbuf[0]) {
debug("\r\nThe received SNEP message's major version is different\r\n");
return -4;
}

// expect a put request
if (SNEP_RESPONSE_SUCCESS != rbuf[1]) {
debug("\r\nSNEP Expect a success response\r\n");
return -4;
}
debug("\r\nsnep read successed\r\n");
if(snep.llcp->disconnect(timeout))
{
debug("\r\nsnep disconect successful\r\n");
}
else
{
debug("\r\nsnep disconect fail\r\n");
}

return 1;
}