"Extended IOKXSocketClientUnifiedApiExchangeData to give the possibil…

…ity to subscribe on ticker updates for mutiple symbols. (#34)

Ex:
{   "op": "subscribe",   "args": [     {       "channel": "tickers",       "instId": "BTC-USDT"     } , {       "channel": "tickers",       "instId": "BTC-BRL"     }     ] }"
[feat/add-support-for-subscribe-on-multiple-symbols 911565e] Extended IOKXSocketClientUnifiedApiExchangeData to give the possibility to subscribe on ticker updates for multiple symbols. Ex: {   op: subscribe,   args: [     {       channel: tickers,       instId: BTC-USDT     } , {       channel: tickers,       instId: BTC-BRL     }     ] }

OKX.Net/Clients/UnifiedApi/OKXSocketClientUnifiedApiExchangeData.cs

@@ -54,6 +54,23 @@ public virtual async Task<CallResult<UpdateSubscription>> SubscribeToTickerUpdat
         return await _client.SubscribeInternalAsync(_client.GetUri("/ws/v5/public"), subscription, ct).ConfigureAwait(false);
     }
 
+
+    /// <inheritdoc />
+    public virtual async Task<CallResult<UpdateSubscription>> SubscribeToTickerUpdatesAsync(IEnumerable<string> symbols, Action<DataEvent<OKXTicker>> onData, CancellationToken ct = default)
+    {
+        var symbolSubs = symbols.Select(symbol =>  
+            new Objects.Sockets.Models.OKXSocketArgs
+                {
+                    Channel = "tickers",
+                    Symbol = symbol
+                }
+        ).ToList(); 
+
+        var subscription = new OKXSubscription<OKXTicker>(_logger, symbolSubs , onData, null, false);
+
+        return await _client.SubscribeInternalAsync(_client.GetUri("/ws/v5/public"), subscription, ct).ConfigureAwait(false);
+    }
+
     /// <inheritdoc />
     public virtual async Task<CallResult<UpdateSubscription>> SubscribeToOpenInterestUpdatesAsync(string symbol, Action<DataEvent<OKXOpenInterest>> onData, CancellationToken ct = default)
     {

OKX.Net/Interfaces/Clients/UnifiedApi/IOKXSocketClientUnifiedApiExchangeData.cs

@@ -162,6 +162,17 @@ public interface IOKXSocketClientUnifiedApiExchangeData
     /// <returns></returns>
     Task<CallResult<UpdateSubscription>> SubscribeToTickerUpdatesAsync(string symbol, Action<DataEvent<OKXTicker>> onData, CancellationToken ct = default);
 
+
+    /// <summary>
+    /// Subscribe to the last traded price updates, bid price, ask price and 24-hour trading volume of instruments. Data will be pushed every 100 ms.
+    /// <para><a href="https://www.okx.com/docs-v5/en/#order-book-trading-market-data-ws-tickers-channel" /></para>
+    /// </summary>
+    /// <param name="symbols">Symbol</param>
+    /// <param name="onData">On Data Handler</param>
+    /// <param name="ct">Cancellation Token</param>
+    /// <returns></returns>
+    Task<CallResult<UpdateSubscription>> SubscribeToTickerUpdatesAsync(IEnumerable<string> symbols, Action<DataEvent<OKXTicker>> onData, CancellationToken ct = default);
+
     /// <summary>
     /// Subscribe to the recent trades data updates. Data will be pushed whenever there is a trade.
     /// <para><a href="https://www.okx.com/docs-v5/en/#order-book-trading-market-data-ws-trades-channel" /></para>