This part completes the Excel–Python–MetaTrader 5 bridge by moving the MT5 side into MQL5 as a Service, avoiding the “script must stay on a chart” limitation. Running as a service keeps the connector independent of charts while still able to open/close charts and control terminal state.
The system is deliberately split into three cooperating processes: a Python socket server, VBA in Excel, and an MQL5 client. The recommended workflow is incremental testing: validate Python first, then Excel↔server messaging, then attach MT5.
On the MQL5 side, the core is a persistent TCP client loop with explicit socket cleanup on failed connects, configurable host/port parameters, and a defensive receive buffer strategy to prevent losing data when reads arrive in bursts.
A simple text protocol is parsed character-by-character to extract a symbol and a command, return...
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