Bridge Protocol Example

//@version=5
// ═══════════════════════════════════════════════════════════════════════════
//  EXAMPLE: making any Pine strategy speak the TV→NinjaTrader bridge protocol
//
//  The bridge doesn't care what your strategy's logic is. It only needs each
//  order event to carry a JSON alert_message with these fields:
//
//    action    "buy" | "sell" | "reduce" | "exit" | "flatten"
//    symbol    your chart's ticker (syminfo.ticker), e.g. "MNQ1!"
//    qty       contracts (integer). Required for buy/sell/reduce.
//    sl        stop-loss PRICE for the resting backstop order (0 = none)
//    tp        take-profit PRICE (0 = none)
//    strategy  a short unique tag for THIS strategy, e.g. "MYSTRAT"
//
//  Then create ONE alert on the strategy:
//    Condition: <your strategy> → "Order fills and alert() function calls"
//    Message:   {{strategy.order.alert_message}}
//    Webhook:   https://YOUR-DOMAIN.ngrok-free.app/webhook?token=YOUR_TOKEN
//
//  ⚠ Any time you change the strategy's settings or code, DELETE and
//    RE-CREATE the alert — alerts snapshot settings at creation time.
// ═══════════════════════════════════════════════════════════════════════════
strategy("Bridge Protocol Example", overlay=true)

TAG = "MYSTRAT"                    // must match the executor's "Signal tag"
qty = input.int(1, "Contracts", minval=1)

// --- toy signal: MA cross (replace with your real logic) ---
fast = ta.sma(close, 10)
slow = ta.sma(close, 30)
longSig  = ta.crossover(fast, slow)
shortSig = ta.crossunder(fast, slow)

// --- protective levels (replace with your real logic) ---
atr = ta.atr(14)
longSl(c)  => c - 2 * atr
shortSl(c) => c + 2 * atr

// --- JSON builders ---
f_entryMsg(string act, float slPx, float tpPx) =>
    '{"action":"' + act + '","symbol":"' + syminfo.ticker + '","qty":' + str.tostring(qty) +
     ',"sl":' + str.tostring(slPx) + ',"tp":' + str.tostring(tpPx) + ',"strategy":"' + TAG + '"}'
exitMsg = '{"action":"exit","symbol":"' + syminfo.ticker + '","strategy":"' + TAG + '"}'

// --- orders with alert messages attached ---
if longSig and strategy.position_size <= 0
    strategy.entry("L", strategy.long, qty=qty, alert_message=f_entryMsg("buy", longSl(close), 0))
if shortSig and strategy.position_size >= 0
    strategy.entry("S", strategy.short, qty=qty, alert_message=f_entryMsg("sell", shortSl(close), 0))

// exits: attach exitMsg to EVERY way the strategy can close a position,
// so NinjaTrader always hears about it
strategy.exit("XL", from_entry="L", stop=longSl(strategy.position_avg_price),  alert_message=exitMsg)
strategy.exit("XS", from_entry="S", stop=shortSl(strategy.position_avg_price), alert_message=exitMsg)

plot(fast, color=color.teal)
plot(slow, color=color.orange)