It is quite painful, Keith, and without synchronous APDUs it will be more difficult.
A few suggestions, wait until v2.3 is released view synchronous APDUs, in the meantime here is a code to at least generate APDUs for each 4 bytes of data.
int currentPage;
int positionInEncodedString = 0; //offset between position in encodedDataString and data block in tag
NSString* encodedDataString = "23 d1 01 1f 55 73 6d 73 3a 35 35 35 35 35 35 35 35 35 26 62 6f 64 79 3d 69 20 6c 6f 76 65 20 79 6f 75 FE"
encodedDataString = [encodedDataString stringByReplacingOccurrencesOfString:@" " withString:@""]; // remove whitespace
NSString *encodedHexStringWithTLVValues = [self addTLVValues:encodedDataString];
while (encodedHexStringWithTLVValues.length % 8 != 0){
encodedHexStringWithTLVValues = [encodedHexStringWithTLVValues stringByAppendingString:@"0"];
}
for (FmDevice *device in connectedDevicesList) {
BOOL isCorrectDeviceId = [[device serialNumber] isEqualToString:[deviceId uppercaseString]];
NSLog(@"isCorrectDeviceId: %@", [NSNumber numberWithBool:isCorrectDeviceId]);
if ([[device serialNumber] isEqualToString:[deviceId uppercaseString]]) {
for (currentPage = 4; currentPage*4 <= encodedHexStringWithTLVValues.length; currentPage+=1){
NSUInteger length = encodedHexStringWithTLVValues.length;
NSLog(@"currentPage*4: %d", currentPage*4 );
NSLog(@"length %lu", (unsigned long)length);
NSLog(@"currentPage: %@", [NSString stringWithFormat:@"%02X", currentPage]);
NSString *next4BytesToWrite = [encodedHexStringWithTLVValues substringWithRange:NSMakeRange(positionInEncodedString, 8)];
NSLog(@"next4BytesToWrite: %@", next4BytesToWrite);
NSString *apdu = [NSString stringWithFormat: @"FF D6 00 %02X 04 %@",currentPage, next4BytesToWrite];
positionInEncodedString+=8;
int64_t delayInSeconds = 0.1;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
[device sendApduCommand:apdu];
});
if ([next4BytesToWrite containsString:@"fe"]){
return;
}
}
}
}
- (NSString *)addTLVValues: (NSString *)hexString {
NSLog(@"encodedDataString: %@", hexString);
NSString *tagString = @"03"; //null values and tag
NSString *length = [NSString stringWithFormat:@"%02lX", hexString.length/2];
NSLog(@"lenght: %@", length);
NSString *terminator = @"fe";
NSString *encodedHexStringWithTLVValues = [NSString stringWithFormat:@"%@%@%@%@",tagString,length,hexString,terminator];
NSLog(@"encodedHexStringWithTLVValues: %@", encodedHexStringWithTLVValues);
return encodedHexStringWithTLVValues;
}
Found here
You could also buy a FloBLE Plus along with downloading the free iOS app NFC Actions. This app comes with the feature to write NFC tags using the FloBLE Plus (we are aiming to add the MSR in the future but cannot guarantee a timeline).
Please let me know if you have any more questions.
Kind Regards,
Scott
Keith.
Scott.
