Uplink only to one Server at the same Time ?

[Thomas Füll, DG1FDV]

Hi all,

i setup an aprsc Server on an Raspi 1b and ist works fine, only the Uplink wil lsend the files only to one aktive server.
Backgroud is that i will send the files to an local/ internal Server on which also other user locations and devices will be shown and also to an official APRS Server at DB0ZDF.

The Entry in the aprs.conf:
Uplink "APRS" full tcp 44.225.80.100 10152 #APRS Server @ DB0ZDF
Uplink "OGN" full tcp 192.x.x.x 10152 # internal Server

Actualy the Server connect only to APRS ( DB0ZDF) but noch to the internal, if DB0ZDF is offline then he connect to the internal Server. (looks like the Rotate Syntax)

Many Thanks
Thomas, DG1FDV

[Heikki Hannikainen]

On Mon, 30 May 2016, 'Thomas Füll, DG1FDV' via aprsc wrote:

> i setup an aprsc Server on an Raspi 1b and ist works fine, only the
> Uplink wil lsend the files only to one aktive server.

Correct. To prevent loops and delayed packet bursts, and general meltdowns
of the APRS-IS network, each server can only connect to a single uplink at
a time. The APRS-IS network architecture doesn't work in a config with
loops - there used to be some, and it caused serious problems.

> Backgroud is that i will send the files to an local/ internal Server on
> which also other user locations and devices will be shown and also to an
> official APRS Server at DB0ZDF.

You need to configure that other local/intenal server to connect to the
aprsc server in question, as a client.

> Actualy the Server connect only to APRS ( DB0ZDF) but noch to the
> internal, if DB0ZDF is offline then he connect to the internal Server.
> (looks like the Rotate Syntax)

Correct, you can configure a list of alternative servers and then it'll
keep a connection to one of them.

- Hessu

[Thomas Füll, DG1FDV]

Hello,

many thanks for your answer Hessu !

Now the Question is how could i connect Uplink Server as a Client to the local
aprsc Server ? The Syntax in the config File shows no Entry for this szenario.
I try it with uplink as an "ro" tcp Server but this also not work. The client
Software could only connect to one Server.

Any Idea ?

73
Thomas

[Heikki Hannikainen]

On Mon, 6 Jun 2016, 'Thomas Füll, DG1FDV' via aprsc wrote:

> Am Dienstag, 31. Mai 2016 17:33:59 UTC+2 schrieb Heikki Hannikainen:
>> On Mon, 30 May 2016, 'Thomas Füll, DG1FDV' via aprsc wrote:
>>
>>> i setup an aprsc Server on an Raspi 1b and ist works fine, only the
>>> Uplink wil lsend the files only to one aktive server.
>>
>> Correct. To prevent loops and delayed packet bursts, and general meltdowns
>> of the APRS-IS network, each server can only connect to a single uplink at
>> a time. The APRS-IS network architecture doesn't work in a config with
>> loops - there used to be some, and it caused serious problems.
>>
>>> Backgroud is that i will send the files to an local/ internal Server on
>>> which also other user locations and devices will be shown and also to an
>>> official APRS Server at DB0ZDF.
>>
>> You need to configure that other local/intenal server to connect to the
>> aprsc server in question, as a client.
>

> Now the Question is how could i connect Uplink Server as a Client to the local
> aprsc Server ? The Syntax in the config File shows no Entry for this szenario.
> I try it with uplink as an "ro" tcp Server but this also not work. The client
> Software could only connect to one Server.

I'm not sure I understand what you're trying to achieve. Could you draw a
picture?

aprsc does not support connecting to multiple uplink servers, except when
*all* of those uplinks are read-only ("multiro"). This is because the
APRS-IS network does not safely support such a setup.

- Hessu