Re: RSSI value in floating point

"David Stockwell" <dstockwell@xxxxxxxxxxxxxxxxx> · Sun, 22 Jun 2008 17:41:22 -0500

The constraint is actually in the Bluetooth 
Specification, which specifies that RSSI is a single signed octet (byte) with a 
range of -127 to +127 in dB.  I have attached a screenshot of the section 
for you.

If you wish, you can return the signed integer 
returned from BlueZ and convert it yourself to a float, but recognize that the 
underlying value is an integer.

If you have not done so already, suggest you get a 
copy of the Bluetooth specification, which describes the BT protocol and stack 
in detail.  The specification is available from the Bluetooth SIG, at http://www.bluetooth.org/ 

Best regards,

David Stockwell

  ----- Original Message ----- 
  From: 
  Khairulmizam 
  Samsudin 
  To: BlueZ development 
  Sent: Saturday, June 21, 2008 8:59 
  PM
  Subject: Re:  RSSI value in 
  floating point

1. Thanks. That saved me a lot of time
2. Assuming that I 
  purchase a development kit. Would it be possible to modify bluetooth stack to 
  achieve the objective?

Regards
xource

Marcel Holtmann wrote: 
  Hi,

    I have inspect bluez-libs codes and seems that some modification can 
make it happen. However, would the devices it self return RSSI in 
floating point?

simple answer is no. The RSSI is a signed integer.

Regards

Marcel

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Attachment:
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Description: JPEG image
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