hi,

is Zorro having some work around to fight against the too common broker issues, like : server busy & requotes ?
MT4 users can include some good headers (mqh) written by 7bit, hanover or mladen for example.
I've not found explanation/documentation about such problem.

The user is not supposed include such headers. Broker server communication is handled by the software, not by a user script.

Requotes are managed by the broker plugin. For brokers that requote, the plugin must provide a command where the user can set up his requote acceptance limit. This is not an issue with the current plugins, as FXCM doesn't requote.

Thanks for your answer; in fact i was thinking about "how to check that an order has been really filed ? "
I cant speak about the recent fxcm servers management (and their common errors), maybe now everything is transparent. But quite all brokers claim they dont requote, even if quite every day, some orders are refused due to "server busy" or "requote" (at least the broker i'm using is still weirdly acting, even its one of the "we never requote" claimer).

As Zorro will be also able to file orders with the other MT4 brokers, that question is not deprecated (sadly).

Yes, the MT4 plugin will handle requotes.

A broker server is normally not busy, unless the broker runs his business from home and uses his PC as a server. What you mean is that trades are rejected because no quotes are available. This happens frequently and with all brokers.

If a trade is entered and no quotes are available because it's weekend or for some other reason, Zorro just does not execute the trade.

If a trade is exited and no quotes are available, Zorro continues to close the trade until it is finally closed.

Your script can check with flags if any trade is currently pending, opened, rejected, etc.

An other common issue is : "server disconnect"

which is not related to the usual closed market (weekend) but is related to technical unexpected trouble. In such case with MT4, the user can manually rescan the server to expect a connection, or insert some code inside the EA to detect and force the re-connection.
How Zorro can deal with a such problem ?

note: i'm speaking about issues found with the main brokers in the place.

All technical communication and connection problems are handled by the platform, not by scripts. You're not supposed to write scripts for solving server connection issues.

This is not specific to Zorro, but to all professional trading software. Trading part and technical part are normally strictly separated. You would also not expect to write a script for reconnecting your browser anytime when Internet connection was lost. The browser just reconnects. So does Zorro.