Arduino send long string to Android

Question

I'm trying to send long String to Android via bluetooth.

but,

enter image description here

It looks like the picture.

some characters are changed.

how can I get an exact full string?

arduino code :

    for(int i=0;i<16;i++){
      String rec = String(P[i], HEX);
      if(rec.length()<2) rec = "0"+rec;
      BTSerial.println(rec);
      delay(50);

P is a byte array. Thanks.

in your code a } is missing

datafiddler
– datafiddler

2016-08-10 09:06:21 +00:00
Commented Aug 10, 2016 at 9:06 — datafiddler
– datafiddler, Commented Aug 10, 2016 at 9:06

datafiddler · Accepted Answer · 2016-08-10 13:09:16Z

1

Try it without String objects:

// return '0' .. 'F'
char hexnibble(byte nibble) {
  nibble &= 0x0F; // just to be sure
  if (nibble > 9) return 'A' + nibble - 10;
  else return '0' + nibble; 
}

void loop() {
 byte P[16]; 
 //  ... fill P somehow ...
 char rec[33];
 for(int i=0;i<16;i++){
      rec[2*i] = hexnibble(P[i] >> 4);
      rec[2*i+1] = hexnibble(P[i] & 0x0F);
 }
 rec[32] = 0; // string terminator

Serial.println(rec); // just for debugging
delay(1000);
}

edited Aug 10, 2016 at 13:09

answered Aug 10, 2016 at 9:05

datafiddler

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1 Comment

datafiddler Over a year ago

Happy to read it helped, even with the small syntax errror (sorry for that)

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