[hpsdr] Hermes board Ethernet Port number

Sun Feb 20 07:09:21 PST 2022

Ingolf,

The difference is that BROADCAST PACKETS are not sent off the subnet, without extraordinary action being taken by the user.  OpenHPSDR software uses a broadcast packet from the PC to 'ping' all the available OpenHPSDR Ethernet devices (Metis and Hermes and others such as Angelia and Orion, I suspect) that are on the subnet.  Those devices are what can be used from regular OpenHPSDR software.

Why port 1024? It's a publicly available (not publicly/permanently assigned) port.

That's why.  Everything else is 'choices made in the distant past, over a decade ago, now'.  All so that all the tools like the bootloader could find and load firmware onto boards, and the software could discover what devices are available at what IP addresses.

Really, the KISS Konsole code shows you exactly how discovery works.  It's all laid bare right there.  Using that, you (and in fact anyone) are of course free to implement any improvements you want to make and contribute them back to the community.

73,
George K9TRV

-----Original Message-----
From: Ingolf, SM6FHZ <ingolf.fhz at gmail.com> 
Sent: Sunday, February 20, 2022 9:42 AM
To: Tom McDermott <tom.n5eg at gmail.com>
Cc: George Byrkit <ghbyrkit at chartermi.net>; HPSDR list <Hpsdr at lists.openhpsdr.org>; Simon Brown <simon at sdr-radio.com>
Subject: Re: [hpsdr] Hermes board Ethernet Port number

Hi Tom
Let's start from the beginning.
I found out that Apache Labs was up to manufacturing a batch of Hermes boards.

https://apache-labs.com/al-products/1022/Open-HPSDR-Hermes-14-bit-ADC-EP3C25-Transceiver-Card-Assembled--Tested.html

I also got to know that Simon, G4ELI, will incorporate support for this board in SDR Console.
As I use SDR Console for my other SDR activities, I thought that was a great idea.

I have a remote QTH (summer / EME QTH) with 100/100 Mbps fiber connection. 
Using SDR Console I access all my Ethernet based SDR's (e.g. AFEDRI etc) remotely. It works very well.
I use "Port Forward" in my remote router for this. Works great.
I have not yet set up a VPN tunnel for this connection, even if I have had thoughts to do so.
I intended to do the same with SDRC and the Hermes board.

It would be a pity if that was not possible with this combination.
It would be interesting to understand what the difference is that prohibits that.
I am certainly NOT a network guru in any way, so I do not know all the pitfalls and possibilities that may exist.
But I have anyway come up with a scheme that has worked very well so far.

I do hope that it will be feasible to do so using SDRC.

73 / Ingolf, SM6FHZ

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Den sön 20 feb. 2022 kl 14:55 skrev Tom McDermott <tom.n5eg at gmail.com <mailto:tom.n5eg at gmail.com> >:

	Hi Ingolf,   it would be helpful to understand what you are trying to accomplish.

	OpenHPSDR V1 and V2 both use broadcasts to find target devices on the local subnet via port 1024.
	Such broadcasts are not routed (as George previously indicated), the various HPSDR application programs
	will not find an openhpsdr device on a different subnet.  

	In order to have a remote device be found, a VPN is generally used to extend the local subnet tunneled
	through the internet to a remote location which then would have that same subnet address range.  Various
	VPN protocols have emerged in the last few years to make that a bit easier than it used to be.  With a
	VPN your home internet router passes the VPN protocol, it does not see the raw broadcast frames or
	port numbers as those are inside the VPN tunnel.  Merely opening a port (destination NAT) on your home router 

	would not allow you to remote to the OpenHPSDR device through the public internet.

	-- Tom, N5EG

	On Sat, Feb 19, 2022 at 9:02 AM Ingolf, SM6FHZ <ingolf.fhz at gmail.com <mailto:ingolf.fhz at gmail.com> > wrote:

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		OK George.
		Thanks for your answer.
		I don't really need to change the port number on the board as I will do Port Forward in my router anyway.
		More of curiosity or if there would be a port number coilission in my network.
		Thanks again for your answer, George!
		Waiting for my Hermes board to be delivered from Apache Labs in late March.
		73 / Ingolf, SM6FHZ

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		Den lör 19 feb. 2022 kl 17:38 skrev George Byrkit <ghbyrkit at chartermi.net <mailto:ghbyrkit at chartermi.net> >:

			I think that if you rebuilt the firmware with your change, and all application software (including for example bootloaders), it might work to change the port.  IIRC (and at 71 that’s suspect) the protocol was not intended to be routed.

			73,
			George K9TRV

			-----Original Message-----
			From: Ingolf, SM6FHZ <ingolf.fhz at gmail.com <mailto:ingolf.fhz at gmail.com> > 
			Sent: Saturday, February 19, 2022 11:22 AM
			To: George Byrkit <ghbyrkit at chartermi.net <mailto:ghbyrkit at chartermi.net> >
			Cc: Hpsdr at lists.openhpsdr.org <mailto:Hpsdr at lists.openhpsdr.org> 
			Subject: Re: [hpsdr] Hermes board Ethernet Port number

			Thanks for the answer George.
			Do you know if it is possible to change it on the Hermes board / FW like you set the wanted IP address?
			73 / Ingolf, SM6FHZ

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			Den lör 19 feb. 2022 kl 17:13 skrev George Byrkit <ghbyrkit at chartermi.net <mailto:ghbyrkit at chartermi.net>  <mailto:ghbyrkit at chartermi.net <mailto:ghbyrkit at chartermi.net> > >:

			        I believe it is port 1024.  My reference is the Kiss Konsole source for file
			        EthernetDevice.cs.

			        73,
			        George K9TRV

			        -----Original Message-----
			        From: Hpsdr <hpsdr-bounces at lists.openhpsdr.org <mailto:hpsdr-bounces at lists.openhpsdr.org>  <mailto:hpsdr-bounces at lists.openhpsdr.org <mailto:hpsdr-bounces at lists.openhpsdr.org> > > On Behalf Of Ingolf, SM6FHZ
			        Sent: Saturday, February 19, 2022 10:56 AM
			        To: Hpsdr at lists.openhpsdr.org <mailto:Hpsdr at lists.openhpsdr.org>  <mailto:Hpsdr at lists.openhpsdr.org <mailto:Hpsdr at lists.openhpsdr.org> > 
			        Subject: [hpsdr] Hermes board Ethernet Port number

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		Ingolf, SM6FHZ
		http://www.2ingandlin.se/SM6FHZ.htm
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