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ezuk replied on July 30, 2008 06:09 to the question "EM202 Default Firmware Truncates Bytes" in Tibbo:

I believe it's a firmware-dependant memory constraint.

We are trying to promote programmability, and this is where we're focusing most of our efforts. If you solved it using Tibbo BASIC -- that's actually going in the direction we want to go.

Brian replied on July 23, 2008 23:10 to the question "EM202 Default Firmware Truncates Bytes" in Tibbo:

So I think the best thing to do is to modify the firmware so that it allows a fixed message size everytime. We can already do this with our custom Tibbo firmware using TiOS and I imagine it would be pretty easy for the Tibbo developers to do.

T-bone replied on July 23, 2008 08:18 to the question "EM202 Default Firmware Truncates Bytes" in Tibbo:

The 127 byte packet size is the initial (or the first tried) size that the Tibbo defaults to when the packet size negotiation is being done. The actual limit on the packet size should be around 1600 bytes. The MTU is the "MAX" size, does not guarantee that all packets will be negotiated to this size. However, there are no settings to adjust this manually.

ezuk replied on July 23, 2008 07:22 to the question "EM202 Programmable Change IP Function" in Tibbo:

Did you implement S [set] IP command on your Tibbo BASIC application?

http://docs.tibbo.com/soism/command_s...

Brian replied on July 22, 2008 01:41 to the question "EM202 Programmable Change IP Function" in Tibbo:

So not for EM202 running TiOS with custom Tibbo basic firmware? I guess we could always make our own utility to perform the same function and not use device explorer.

How come the default firmware allows change IP behavior even though we are doing the same thing except we added some more functionality? We are also doing Serial-over-IP with our firmware.

T-bone replied on July 22, 2008 01:26 to the question "EM202 Programmable Change IP Function" in Tibbo:

Change IP is for our devices loaded with Serial-over-IP firmware.

Brian replied on July 21, 2008 22:26 to the question "EM202 Programmable Change IP Function" in Tibbo:

Change IP is disabled in Device Explorer... clues?

Brian replied on July 21, 2008 14:16 to the question "EM202 Default Firmware Truncates Bytes" in Tibbo:

Doesn't make sense to me because the maximum packet size can be 1500 bytes. We made our own Tibbo firmware using TiOS and the packets do not get fragmented. The Tibbo fragments these packets... not the negotiation between the devices. We are running the same hardware but with our custom Tibbo code and the packets do not get fragmented into two or more packets if it is larger 127 bytes.

Ethernet MTU is 1500 and Internet MTU is 576 bytes. The configured MTU size on PC and Tibbo is 1500.

ezuk replied on July 21, 2008 13:01 to the question "EM202 Default Firmware Truncates Bytes" in Tibbo:

Well, it's not exactly what the setting means.

TCP _will_ split data across packets, because that's how it works. The 127 bytes is a number negotiated between the DS and the computer -- we can't control it via a firmware setting.

But this should not really interfere with what you're trying to do... Assemble the packets on the other end.

Brian asked a question in Tibbo on July 20, 2008 18:15:

EM202 Default Firmware Truncates Bytes

Why does EM202 default firmware truncate tcp message sizes larger than 127 bytes?

EM202 default firmware will break messages into two or more parts if the serial data is larger than 127 bytes.... We wrote custom tibbo firmware to avoid this but it seems like a bug to me... Why not 255 bytes or make it programmable? DS Manager has a setting you can change, but it seems to have no effect.

Brian replied on July 20, 2008 17:56 to the question "EM202 Programmable Change IP Function" in Tibbo:

Thanks! I did a sniff and never did know what the A and D meant..... I will take look and see if I can implement.

ezuk replied on July 20, 2008 13:45 to the question "EM202 Programmable Change IP Function" in Tibbo:

Hello!

Here are a couple of links to the docs:

1) http://docs.tibbo.com/taiko/net_ip.htm

This is for what setting to change.

2) http://docs.tibbo.com/soism/command_s...

This is for how the setting command works for the fixed firmware (if you want to emulate it)

3) http://www.tibbo.com/terminal_demo.php

This is for a demo which actually already has this "change IP using broadcast" code in it, working. You can copy it or learn from it.

Good luck!

Brian asked a question in Tibbo on July 20, 2008 02:43:

EM202 Programmable Change IP Function

How do I implement the "Change IP" function in my programmable EM202 Tibbo? The Change IP function I am referring to is the one that is Device Explorer and you can do this with the default firmware.