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I am using a Raspberry Pi 2 Wheezy with a Bluetooth dongle to capture data from an ELM 327 OBD.

I can list the OBD device but I am unable to connect to that through Bluetooth. I am getting an error like:
Console snapshot

Can't connect RFCOMM socket: Host is down

Please help me to solve this.

  • what bluetooth dongle are you running? – Mohammad Ali Jul 18 '17 at 5:36
  • also can you please share the result of the following command hciconfig – Mohammad Ali Jul 18 '17 at 5:39
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    Why not dist-upgrade from "wheezy" to "jessie"? This is so that you move to the current (Raspbian 8.x) version - and given that Raspbian tracks the upstream Debian distribution we'll get "Stretch" (9.0) sometime soon: raspberrypi.org/forums/viewtopic.php?f=66&t=186300 – SlySven Jul 20 '17 at 23:05
  • +1 for upgrading to Jessie as Wheezy is no longer receiving updates. – Steve Robillard Jul 24 '17 at 1:26
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This was tested is Jessie rather than wheezy but should still work. See image below for an example but type:

$sudo systemctl start bluetooth
$sudo bluetoothctl
#power on
#agent on
#scan on
#trust MAC_ADDRESS
#exit
$sudo rfcomm connect 0 MAC_ADDRESS 1

I have obscured MAC addresses and device names because it is a client's device.

enter image description here

  • We also got the same in Jessie but need to implement the same in Wheezy. – Anshad Rasheed Jul 19 '17 at 11:12
  • Unfortunately I don't have any experience with Wheezy and I don't have time to set up a Pi with it on. I would suggest looking at any Bluetooth tutorials which pre-date Jessie's release (Approx September 2015) such as this one to see if they do anything similar to what you're tying to do. If you could post some information on what dongle you are using and what steps you have already tried that might help other users as well. – pfl Jul 19 '17 at 12:03
  • Also when you try my answer in Wheezy does the bluetoothctl work or does it give any error messages? – pfl Jul 19 '17 at 12:04

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