RRD Graph for cellular - not working

[jai]

Hi,
I'm having a little play with 2.0-BETA5 and my 3G USB modem (huawei E1762). Setting it up and getting it working couldn't have been much easier, unless PPP0 was an eligible WAN interface option during install/setup ;)

Anyway for the record the RRD graph on the cellular tab does not work. I had a bit of a look into the issue and found that in the script /var/db/rrd/updaterrd.sh under the "# polling 3G." section, the script returns the command:
3gstat -s -d /dev/ugen0.2

which in turn returns "3gstat: error reading from device: No such file or directory". I had a look at 3gstat.c but I didn't really understand what it was doing (I'm not a programmer).

However searching the net it would appear that the way to query this modem was via an AT command on either of the device entries /dev/cuaU0.0 or /dev/cuaU0.1. For instance, I can while a PPP session is active on /dev/cuaU0.0 run cu -l /dev/cuaU0.1 and connect to the modem then "AT+CSQ" and get a response like "+CSQ: 11,99". See table below.

So I'm curious what 3gstat tries to do and why the updaterrd.sh script wants to do it on /dev/ugen0.2 and not one of the modems devices /dev/cuaU0.0 or /dev/cuaU0.1.

Regards,
Jai

Signal dBm equivalent from www.zimbio.com/New+Mobile+Phones/articles/UjumaKIobfk/How+Measure+Improve+Mobile+Broadband+Reception
0 < -113 dBm (Marginal)
1 -111 dBm (Marginal)
2 -109 dBm (Marginal)
3 -107 dBm (Marginal)
4 -105 dBm (Marginal)
5 -103 dBm (Marginal)
6 -101 dBm (Marginal)
7 -99 dBm (Marginal)
8 -97 dBm (Marginal)
9 -95 dBm (Marginal)
10 -93 dBm (Workable under most conditions)
11 -91 dBm (Workable under most conditions)
12 -89 dBm (Workable under most conditions)
13 -87 dBm (Workable under most conditions)
14 -85 dBm (Workable under most conditions)
15 -83 dBm (Good)
16 -81 dBm (Good)
17 -79 dBm (Good)
18 -77 dBm (Good)
19 -75 dBm (Good)
20 -73 dBm (Excellent)
21 -71 dBm (Excellent)
22 -69 dBm (Excellent)
23 -67 dBm (Excellent)
24 -65 dBm (Excellent)
25 -63 dBm (Excellent)
26 -61 dBm (Excellent)
27 -59 dBm (Excellent)
28 -57 dBm (Excellent)
29 -55 dBm (Excellent)
30 -53 dBm (Excellent)
31 > -51 dBm (Excellent)