Values from the notification should be hexadecimal but I got decimal and negative values (with another app I got the good format) :
123 0 0 72 98 0
124 0 0 39 97 0
125 0 0 -2 95 0
126 0 0 -50 94 0
127 0 0 -105 93 0
-128 0 0 88 92 0
-127 0 0 18 91 0
-126 0 0 -59 89 0
-125 0 0 113 88 0
-124 0 0 22 87 0
-123 0 0 -76 85 0
-122 0 0 76 84 0
-121 0 0 -35 82 0
-120 0 0 103 81 0
Do you know how can I get this in Hexadecimal form?
Best regards
The RxAndroidBle library emits a byte[] when a notification is received. A single byte value can be represented in a different ways.
The log you have presented is just printing the raw values according to Java specification. Java does not have a concept of unsigned values and every value that starts with a 1 bit is treated as a negative number. i.e. 0xA2 is equivalent to -94. (0xA2 == -94) == true
A simple way to display a value as a hex is to use String.format() i.e. String.format("0x%2xh", byteValue)
Most probably you wanted to ask a question: How to convert a byte array to a hex String in Java
I wrote a little method to convert a byte[] into a String that looks like [02 FC 41 5A] etc.:
static String byteArrayToHexDigits(final byte[] bytes) {
int i;
StringBuilder result = new StringBuilder( "[" );
for( i = 0; i < (bytes.length-1); i++ ) {
result.append(String.format( "%02X ", bytes[i] ));
}
result.append(String.format( "%02X]", bytes[i] ));
return result.toString();
}
