CopyRates v2.0 - MetaTrader is null

[duzers]

TimeFrame: 1 minute
var count = _mtApiClient.CopyRates(TimeSeriesValues.SymbolValue, TimeSeriesValues.TimeFrame, DateTime.Now, DateTime.Now.AddMonths(-12), out array);

[13] [DEBUG] SendCommand: sending '{"Symbol":"GOLD.pro","Timeframe":1,"StartTime":1772766296,"StopTime":1741230296}' ...
[8] [DEBUG] MtRpcClient.DoWrite: sending message: 0;465740;3;1141;{"Symbol":"GOLD.pro","Timeframe":1,"StartTime":1772766296,"StopTime":1741230296}
[13] [DEBUG] SendCommand: received response JSON []
[13] [WARN] SendCommand: Response JSON from MetaTrader is null or empty

Description of problem:
It is not possible to retrieve a large history (in this case one year back). The Terminal64.exe process does not close after closing MetaTrader 5.

When trying to download a shorter history (1 month), I get "MetaTrader is null", but after a longer moment (20 sec) the data is eventually loaded.

Only very short ranges (a few days) work correctly without any issues.

This problem does not occur in MtApi5 v1. It retrieves the selected data range very quickly, even 3 years history.

[tudstudent]

The root cause is the 10-second client-side command timeout. Large CopyRates requests (e.g., 1 year of M1 data) need time for MT5 to download history from the broker + serialize hundreds of thousands of bars to JSON.

Our Python client now has a configurable per-command timeout (default raised to 30s):

rates = client.copy_rates("EURUSD", PERIOD_M1, 0, 500000, timeout=120)

The same approach can be applied to the .NET client by adding a timeoutMs parameter to MtRpcClient.SendCommand().

[vdemydiuk]

I've added the property CommandTimeout to MtApiClient5 to set time of waiting for the result of response from MetaTrader.
Default value is 30 sec now. It is possible to change it in runtime.