Dhan API + websocket algo -- 2

I need a clean, production-ready Python script that plugs into the Dhan API and its WebSocket feed to automate a single intraday play on the current-week NIFTY PE that is three strikes in-the-money (ATM-3). The strike must be picked using the ATM-3 premium itself rather than the spot or futures price.

Logic
• ema + time based logic
• Stop-loss 10 % and target 20 % must be attached instantly. and time based universal exit
• If another position exists in the account the strategy simply ignores it and proceeds with its own rules—no forced square-off or alerting.

Implementation notes
The solution has to rely on Python 3.x, leverage Dhan’s REST endpoints for order placement, and keep WebSocket streaming alive for real-time pricing and stop-loss/target management. Please structure the project so I can run it on dhan and drop in my own API keys. A concise README covering environment setup and a test run for one live session will complete the delivery.

I will consider the job done when the script triggers exactly as specified, places orders with the correct risk parameters, and exits on either stop or target without manual intervention.