Setting up NUC

computer name: ble-nuc- where n is a running number from 1 user name: bleadmin password: ble123456

Setting up hcitool

1. sudo apt-get update
2. $> sudo apt-get install libcap2-bin
3. $> sudo setcap 'cap_net_raw,cap_net_admin+eip' which hcitool
4. sudo apt-get install bluez-hcidump

Install OpenSSH server

1. $> apt-get install openssh-server
2. $> ssh bleadmin@localhostc
3. $> ssh bleadmin@
4. other commands: $> service ssh stop $> service ssh start $> service ssh restart $> service ssh status

sudo btmon & hcitool lescan if doesn't manage to lescan try: hciconfig hci0 down hciconfig hci0 up or service bluetooth restart service dbus restart from http://stackoverflow.com/questions/22062037/hcitool-lescan-shows-i-o-error

This worked for me:

As you pointed out, first run the hcitool in the background: sudo hcitool lescan --duplicates Note the use of "duplicates" so we keep on logging the changing RSSI value of the BLE device

Create a script (tester.sh) and insert the following code:

#!/bin/bash

while read address
do
    read RSSI
    timestamp=`date`
    echo "$timestamp,$address,$RSSI"
done

in the above we're basically waiting for to lines from stdin (that's the 'read' lines). The first line containing 'read' is the MAC address of the device, the second 'read' line is to get the RSSI value. I also inserted the timestamp just for a more comprehensive answer

Now we use bash pipes to feed in the information we need like so:

sudo hcidump -a | egrep 'RSSI|bdaddr' | cut -f 8 -d ' ' | ./tester.sh > /tmp/result.csv

All we're doing here is using HCIDUMP, then egrep to filter out the lines containing the device address and the RSSI. The output of the egrep command is prepended with a tab, so in the subsequent cut command we have to use the 8th field to get what we're after since i'm separating on ' '. Last we feed this into our script which processes the values and output them in csv format. I then just redirect the output into the csv file

To manipulate the RSSI value you just need to modify the tester.sh file as needed. from http://raspberrypi.stackexchange.com/questions/18292/manipulate-rssi-value

If scanning stops after 2-3 lines make sure you typed “sudo hcitool lescan –duplicates”

Over TCP

To listen on the server: nc -vv -l 0.0.0.0 1234 To send messages: sudo hcidump -a | nc 10.0.0.5 1234

Over UDP

To Send: sudo hcidump -a > /dev/udp/10.0.0.16/12000