[dsdp-tm-dev] autodetect

[javier.montalvoorus@xxxxxxxxxxx]

Hi, 

I have been investigating possible solutions
for the services autodetect process. One standard protocol that could be
used is the DNS-Based Service Discovery  (http://www.dns-sd.org/)
It provides a mechanism to ask, using
DNS queries for available services to a DNS server and provide the necessary
addresses, ports and extra information for each server.

So, DNS-SD could be useful in the following
scenarios:

* Distributed devices:  A central
DNS server mapping all the available services in a network.
* Local/Single device: An embedded DNS
server in the device (or host) mapping the available local services.

As an example of how DNS-SD works, you
could make some queries (that works in Win2K):

Step 1: List the available services
in dns-sd.org:
nslookup -q=any _services._dns-sd._udp.dns-sd.org

Step 2: List the available servers for
one service (in this case _ssh):
nslookup -q=any _ssh._tcp.dns-sd.org

Step 3: List the server information:
nslookup -q=any Rose._ssh._tcp.dns-sd.org


Then, the sequence diagram of the Wizard
with the autodetect process could be:

 

So, has anybody had any experience using
DNS-SD ?  Would you recommend another protocol for the autodetect
process ?

Many thanks,

Javier Montalvo Orús
Engineering
Tools 
Symbian Software Limited.

Tel: +44 (0)207 154 1091

"Oberhuber, Martin" <Martin.Oberhuber@xxxxxxxxxxxxx>
Sent by: dsdp-tm-dev-bounces@xxxxxxxxxxxx

19/04/2006 16:03

Please respond to
Target Management developer discussions <dsdp-tm-dev@xxxxxxxxxxx>

To	"Target Management developer discussions" <dsdp-tm-dev@xxxxxxxxxxx>
cc
Subject	RE: [dsdp-tm-dev] initial discovery service

Hi Javier,
 
Service Discovery (or "autodetect")
is certainly of interest for us at Wind River, too.
As you might remember from the
Toronto meeting, there is a Technology Sub-Group
for Autodetect, but no lead has
been assigned yet -- would you want to lead this
effort? - See http://wiki.eclipse.org/index.php/DSDP/TM
 
I think for the actual autodetect,
there are a few flavors:
* Autodetect during system definition
(in the wizard), assuming that detected services remain the same over time
* Autodetect on each connect,
allowing to disable services as needed
 
The actual detection of services
could go 
* via network (ECF provides some
discovery services through Zeroconf),
* it could be through vendor-specific
agents running on the remote system, 
* or it could be even without
asking the live target, e.g. by looking at a local ELF image of the kernel
on the target or investigating SPIRIT files.
 
In any case, it looks like the
autodetect would basically create a filter that limits a list of 
possible subsystems for a given
system connection to the list of those that are actually 
available; and, for those subsystems
that have been found available, perhaps automatically
set some properties.
 
I was not sure how autodetect
would relate to a view for hardware actions like restart or reflash?

Cheers,
Martin
--
Martin Oberhuber - WindRiver, Austria
+43(662)457915-85

 

---

From: dsdp-tm-dev-bounces@xxxxxxxxxxxx
[mailto:dsdp-tm-dev-bounces@xxxxxxxxxxx] On Behalf Of javier.montalvoorus@xxxxxxxxxxx
Sent: Tuesday, April 11, 2006 5:08 PM
To: Target Management developer discussions
Subject: [dsdp-tm-dev] initial discovery service


Hi All, 

Symbian couldn't attend the phone meeting yesterday, but we would like
to raise a question about the initial discovery of remote embedded systems
and how to manage them. 
We think it would be interesting having a remote system discovery facility,
allowing to retrieve information through a standard protocol such as the
description of the system and the list of available services. 
Also executing basic hardware services on the remote systems (mainly restart
and reflash) could be interesting. 

The discovery facility could consist on: 

* A contribution to the RSE "New Connection"
wizard, at the same position where
RSE allows checking if the provided IP exists 
* A standard TCP/IP based protocol (to be investigated) to report the available
services on the embedded system and start them as requested by the user.
At this stage possibly the SPIRIT information could also be retrieved.
* A view to manage registered embedded systems and perform basic hardware
actions as restart or reflash. 
  
As in the current release only the IP address is checked, possibly an early
handshake with the embedded system could be useful.

Is anybody else interested in this feature ? 

Javier Montalvo Orús
Engineering
Tools 
Symbian Software Limited.

Tel: +44 (0)207 154 1091

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