[App_rpt-users] RTCM question(s)

[Jim Duuuude]

Do you have any way, on the same physical LAN as the RTCM, to put a third device
to monitor packets and use tcpdump/wireshark (depending on your religion.. or ahh choice
of OS's) to see if there is something weird going on? This can easily be accomplished with
the use of an old-fashioned 10base-T hub (not a switch, a HUB).

Jim

From: adamson_alan at hotmail.com
To: App_rpt-users at ohnosec.org
Date: Mon, 11 Jun 2012 15:06:19 -0400
Subject: [App_rpt-users] RTCM question(s)






RTCM question(s)




I occasionally get a connection lost/connect established almost back to back on my RTCM at a remote site.  This is on a hardwired IP connection (finally) with pretty low latency and no significant packet loss in the audio on either side.



e.g. here is my response rate from a remote ping to my RTCM

Pinging <host ipaddress> [64.16….] with 32 bytes of data:

Reply from 64.16….: bytes=32 time=60ms TTL=52

Reply from 64.16….: bytes=32 time=58ms TTL=52

Reply from 64.16….: bytes=32 time=103ms TTL=52

Reply from 64.16….: bytes=32 time=99ms TTL=52

Reply from 64.16….: bytes=32 time=81ms TTL=52

Reply from 64.16….: bytes=32 time=74ms TTL=52

Reply from 64.16….: bytes=32 time=96ms TTL=52

Reply from 64.16….: bytes=32 time=64ms TTL=52

Reply from 64.16….: bytes=32 time=57ms TTL=52

Reply from 64.16….: bytes=32 time=65ms TTL=52

Reply from 64.16….: bytes=32 time=63ms TTL=52

Reply from 64.16….: bytes=32 time=150ms TTL=52

.

.

.

Ping statistics for 64.16….:

    Packets: Sent = 37, Received = 37, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

    Minimum = 57ms, Maximum = 150ms, Average = 87ms



2 questions.  Is there some way to set a time display on the messages on an RTCM when it  isn't connected to a GPS, I can't tell how long the duration is between the back to back messages because all I get is  as follows.  



<System Time Not Set>  ERROR! Host response timeout

<System Time Not Set>  Host Connection Lost (Pri) (24.99.5x.xxx)

<System Time Not Set>  Using Primary Voter Host (24.99.5x.xxx)

<System Time Not Set>  Host Connection established (Pri) (24.99.5x.xxx)

This is a single RTCM running in simple radio interface mode.

Can you run an RTCM in simple mode and still connect it to a GPS?  Will that set it's time locally?

Is there any way to set a parameter to lengthen the timeout timer in either the voter.conf file or the RTCM configuration?  I'm sure we are only talking about a few milliseconds difference is all that's needed.



Thanks in advance,

Alan



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