Please, I need any help to solve my problem.
I can't exchange data normally between Android (4.4.2) phone and Arduino with NFC module, using HCE.
I took example from Android samples, and slightly changed to return just IMEI number.
public byte[] processCommandApdu(byte[] commandApdu, Bundle extras) {
if (Arrays.equals(SELECT_APDU, commandApdu)) {
String data = ((TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE)).getDeviceId();
return ConcatArrays(data.getBytes(), SELECT_OK_SW);
} else {
return UNKNOWN_CMD_SW;
}
}
On Arduino side, my code is:
void loop(){
Serial.println("Waiting for an ISO14443A card");
uint8_t success;
success = nfc.inListPassiveTarget();
if(success){
Serial.println("Found something!");
uint8_t responseLength = 32;
uint8_t response[32];
uint8_t selectApdu[] = {
0x00, /* CLA */
0xA4, /* INS */
0x04, /* P1 */
0x00, /* P2 */
0x05, /* Length of AID */
0xF2, 0x22, 0x022, 0x22, 0x22, /* AID */
0x00 /* Le */};
success = nfc.inDataExchange(selectApdu, sizeof(selectApdu), response, &responseLength);
Serial.print("EX_RES:");
Serial.println(success);
if(success) {
Serial.print("responseLength: ");
Serial.println(responseLength);
for(int i=0; i<responseLength; i++){
Serial.print(response[i]);
Serial.print(", ");
}
Serial.println();
Serial.println("========================");
}
else {
Serial.println("Failed sending SELECT AID");
}
}
else {
Serial.println("Didn't find anything!");
}
delay(1000);
}
Initially, I was receiving "Failed sending SELECT AID", so I tried to figure out why. So i updated code of inDataExchange in PN532.cpp file. So now it looks like this:
// initially function was returning bool
uint8_t PN532::inDataExchange(uint8_t *send, uint8_t sendLength, uint8_t *response, uint8_t *responseLength){
uint8_t i;
pn532_packetbuffer[0] = 0x40; // PN532_COMMAND_INDATAEXCHANGE;
pn532_packetbuffer[1] = inListedTag;
if (HAL(writeCommand)(pn532_packetbuffer, 2, send, sendLength)) {
return 2; // initially was false
}
int16_t status = HAL(readResponse)(response, *responseLength, 1000);
if (status < 0) {
return 3; // initially was false
}
if ((response[0] & 0x3f) != 0) {
DMSG("Status code indicates an error\n");
return 4; // initially was false
}
uint8_t length = status;
length -= 1;
if (length > *responseLength) {
length = *responseLength; // silent truncation...
}
for (uint8_t i = 0; i < length; i++) {
response[i] = response[i + 1];
}
*responseLength = length;
return 5; // initially was true
}
And now, I'm receiving such log output:
Waiting for an ISO14443A card
Found something!
EX_RES:5
responseLength1: 18
35, 51, 53, 55, 50, 52, 54, 48, 53, 52, 49, 57, 50, 55, 49, 57, 144, 0,
========================
Waiting for an ISO14443A card
Found something!
EX_RES:4
responseLength1: 32
11, 51, 53, 55, 50, 52, 54, 48, 53, 52, 49, 57, 50, 55, 49, 57, 144, 0, 0, 36, 0, 0, 3, 5, 17, 2, 117, 0, 194, 1, 6, 7,
========================
Waiting for an ISO14443A card
Found something!
EX_RES:4
responseLength1: 32
1, 51, 53, 55, 50, 52, 54, 48, 53, 52, 49, 57, 50, 55, 49, 57, 144, 0, 0, 36, 0, 0, 3, 5, 17, 2, 117, 0, 194, 1, 6, 7,
========================
Waiting for an ISO14443A card
Found something!
EX_RES:4
responseLength1: 32
11, 51, 53, 55, 50, 52, 54, 48, 53, 52, 49, 57, 50, 55, 49, 57, 144, 0, 0, 36, 0, 0, 3, 5, 17, 2, 117, 0, 254, 0, 0, 0,
========================
I understand that this result is incorrect, and value is unchanged buffer (because of error), except first digit, which is changing from time to time.
Sometimes I receive such strange log:
EX_RES:4
responseLength: 18
11, 219, 13, 51, 8, 187, 181, 0, 2, 54, 1, 1, 2, 140, 0, 7, 72, 1,
EX_RES:4
responseLength: 18
1, 72, 1, 2, 37, 0, 4, 228, 4, 160, 4, 168, 7, 236, 2, 138, 50, 0,
What's the problem? Maybe someone encountered this problem? Maybe there is some problem with library, or I'm doing something wrong?
I'm using: