Note: do the initial tests with the bluetooth dongle straight on the machine (Udoo in my case) instead of plugged in a hub. Scanning works on a hub but for some reason rfcomm doesn't connect very often if the dongle is on a hub.
Quick hack #1:
Check if we can see the device:
root@imx6-qsdl:/home/ubuntu# hcitool scanScanning ...
EC:FE:xx:xx:xx:xx IR-Blue-DM
Same using LE:
root@imx6-qsdl:/home/ubuntu# hcitool lescan
LE Scan ...
EC:FE:xx:xx:xx:xx
Check if we need a pin:
root@imx6-qsdl:/home/ubuntu# bluez-simple-agent hci0 EC:FE:xx:xx:xx:xx
Release
New device (/org/bluez/5683/hci0/dev_EC_FE_xx_xx_xx_xx)
Seems we don't need one, connect using rfcomm.
root@imx6-qsdl:/home/ubuntu# rfcomm connect hci0 EC:FE:xx:xx:xx:xx
Connected /dev/rfcomm0 to EC:FE:xx:xx:xx:xx on channel 1
Press CTRL-C for hangup
^CDisconnected
See if there is any data:
root@imx6-qsdl:/home/ubuntu# cat /dev/rfcomm0
And after you do 'echo >/dev/rfcomm0 "R001\r\n"' in another terminal there is data!:
E211208208208215214212212218220218213222223221218223223221216224225223220227226225222226227225223228228227225229229228225229228229228229230230228230230229230230230231230230230229229227229227227188188188188205205196196205205205196205205205205213205205205205213205205213213213205213213213205213213222213222222222213222222222222222222222222222222222222222222222222222222222222213222222222 0 17 17 10 41 62 62 52 79 86 96 90103121124107131152159138159162169148169183183155179186186162179193193159176190190165176186183148172172176131151158158120124138145 96103107110 65 69 75 68 23255255255255255255255255255255 0 0 0 0 0 0 0 0 0216221205 0 0 0 8150 26 17 93105 36230 79 40 34 0128 0 0255 33 0188 26190 59 25245 27150 26255 30116 91166 32136 44 10 33 1 26EX
R144006836145-00045I -54 -54 -52 -54 -53 -54 -51 -50 -52 -50 -52 -49 -50 -50 -49 -47 -51 -51 -51 -49 -52 -50 -50 -48 -48 -50 -45 -47 -45 -43 -42 -44 -41 -42 -43 -45 -27 -41 -43 -44 -40 -41 -41 -43 -42 -42 -42 -42 -44 -43 -43 -42 -42 -43 -42 -42 -42 -41 -42 -40 -42 -42 -42 -41X
Quick hack #2:
Use a small python routine to read data:
import serial
import time
ser=serial.Serial("/dev/rfcomm0", baudrate=57600,timeout=0.1)
ser.open()
ser.write("R001"+chr(13)+chr(10))
while (1==1):
d=ser.readline()
print len(d),d
Success! Now to write something that gets temperature values and shows the result graphically...
I found the R001 command in the android code on http://github.com/RHWorkshop , the H command can be used to increase the speed at which the data is sent.
