Re: [lwip-users] Networking device discovery protocols

[Noam Weissman]

Hi,

First of all they do not need to type port number as default is 80 for
HTTP, unless you use
a private port at your WEB server. 

As for discovery it depends what you want to achieve. If it is only and
always local network
you can run a simple UDP server that listens on a specific port for a
special packet
(you need to define that). 

Once you defined the protocol and have the server part running at your
embedded side, 
you should run some application (PC app etc...) that sends a discovery
request. This discovery 
message is the define packet sent via broadcast to your embedded. The
embedded side will
receive this packet and response to the client with any data you may
need.

If the device is behind a router or on a company network broadcast is
not sufficient as broadcast
Will work only on the subnet. In that case you will need to send a
multicast message.

If you multicast a message you will have to enable the IGMP module in
your lwipopts.h, add
The IGMP module and in your UDP listening server you will have to join
the multicast group.

Some discovery protocols are bonjour defined by Apple, SDDP defined by
Control4 and others.

Read some info on the above and if you need more information ask and
I'll try to answer.


BR,
Noam.


-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of Adam
Fullerton
Sent: Tuesday, June 16, 2015 11:38 AM
To: address@hidden
Subject: [lwip-users] Networking device discovery protocols

Hi,

I'm using lwIP V1.4.1 in a low power remote monitoring project. Off site
connection is made via a Sierra wireless AirLink GX400 modem. For on
site maintenance connection is made with direct connection to
instrument. In this scenario there is a DHCP server which gives the
clients IP addresses. I would prefer it if they did not have to type in
the V4 IP address and port number into the web browser. If I use the
windows explorer to look at my computer network I can see the DSL modem
and double clicking the icon opens a web browser on the management site.
Can any one tell me what protocols I need to implement to achieve this
and are there any samples of this for lwIP?

Thank you for your help,

Adam.


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