Best way to communicate with hidden devices
I have a BT weight scale and I want to communicate to it. Problem is I think it is set to be un discoverable. According to it's scant documentation it uses the BT serial protocol and a 128 bit encyrption and a PIN. - that it expects to start communication. Supposedly, after it weighs something, it tries to find an ACCESS point, see if the Access Point has the same PIN and if it does it transmits data packets which are very discrete
hcitool --scan and sdptool --browse cannot find it (yes I have made sure it can find other devices). I've turned hcidump too too make sure I can sniff it but to no avail
Honestly, I am new to BlueZ and have been devouring as much documentation as I can. My thoughts are setting up a PAN with an access point role using rfcomm. If anybody has worked on one way traffic bluetooth devices, let me know. I really have no way of knowing whether this weight scale has a broken radio, although I can experiment with making my other devices undiscoverable with a PIN. Unfortunately their support is for Windoze only and require you to buy a container full of weight scales before their engineers will talk to you.
BTW there is a little sticker which seems to be the bdaddr.
Thanks
Noel
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Quoted 7 lines · Noel Paz
I have a BT weight scale and I want to communicate to it. Problem is I think it is set to be un discoverable. According to it's scant documentation it uses the BT serial protocol and a 128 bit encyrption and a PIN. - that it expects to start communication. Supposedly, after it weighs something, it tries to find an ACCESS point, see if the Access Point has the same PIN and if it does it transmits data packets which are very discrete
This sounds like a very strange way of doing things. I'm sure they had their reasons though.
Quoted 3 lines
hcitool --scan and sdptool --browse cannot find it (yes I have made sure it can find other devices). I've turned hcidump too too make sure I can sniff it but to no avail
What did you browse for?
Quoted 8 lines
Honestly, I am new to BlueZ and have been devouring as much documentation as I can. My thoughts are setting up a PAN with an access point role using rfcomm. If anybody has worked on one way traffic bluetooth devices, let me know. I really have no way of knowing whether this weight scale has a broken radio, although I can experiment with making my other devices undiscoverable with a PIN. Unfortunately their support is for Windoze only and require you to buy a container full of weight scales before their engineers will talk to you.
I did a bit of experimentation with a GPS device, documented here:
http://www.maths.tcd.ie/~jscrane/gps/
As described, this device provides a service to which you must connect before it will spit out GPS data.
Quoted 1 line
BTW there is a little sticker which seems to be the bdaddr.
You could try running l2ping against that bdaddr: that should tell you if its working.
Steve
Signature · 1 line
Stephen Crane <[email protected]>