How do I send an unsigned float over the air as a characteristic value?

RE: How do I send an unsigned float over the air as a characteristic value?

Eliot Stock — Thu, 14 Aug 2014 12:33:33 GMT

Works perfectly! Thanks Pål.

RE: How do I send an unsigned float over the air as a characteristic value?

Pål Håland — Thu, 14 Aug 2014 11:43:37 GMT

What about this one?

stackoverflow.com/.../how-to-convert-4-bytes-array-to-float-in-java

byte[] bytes = { };
float f = ByteBuffer.wrap(bytes).order(ByteOrder.LITTLE_ENDIAN).getFloat();

RE: How do I send an unsigned float over the air as a characteristic value?

Knut Eldhuset — Thu, 14 Aug 2014 11:43:27 GMT

The byte order could be different from what the Android app expects. A quick test with Python:

>>> import struct
>>> struct.unpack_from("f", "\00\80\89\40")
(6.706954991386738e-10,)
>>> struct.unpack_from("f", "\40\89\80\00")
(0.0001758192665874958,)

Which is correct?