feat(scanner): more work on the scanner and can now scan to prod no lst right now

lstMobile/src/lib/tcpScan.ts

@@ -0,0 +1,72 @@
+import TcpSocket from "react-native-tcp-socket";
+
+const STX = "\x02";
+const ETX = "\x03";
+
+type TcpResponse = {
+	success: boolean;
+	message: string;
+	data: string[];
+};
+
+/**
+ * Sends a Zebra-style TCP message:
+ * <STX>98@{scanned}<ETX>
+ */
+export async function sendTcpMessage(
+	scanned: string,
+	host: string,
+	port: number,
+	timeoutMs = 5000,
+): Promise<TcpResponse> {
+	return new Promise((resolve) => {
+		const responses: string[] = [];
+
+		const client = TcpSocket.createConnection({ host, port }, () => {
+			const payload = `${STX}98@${scanned}${ETX}`;
+
+			console.log("Sending TCP (raw):", payload);
+			console.log("Sending TCP (visible):", `<stx>98@${scanned}<etx>`);
+
+			client.write(payload);
+		});
+
+		const timeout = setTimeout(() => {
+			client.destroy();
+
+			resolve({
+				success: false,
+				message: "TCP timeout",
+				data: responses,
+			});
+		}, timeoutMs);
+
+		client.on("data", (data) => {
+			const text = data.toString();
+			console.log("TCP received:", text);
+
+			responses.push(text);
+		});
+
+		client.on("error", (err) => {
+			clearTimeout(timeout);
+			client.destroy();
+
+			resolve({
+				success: false,
+				message: err.message,
+				data: responses,
+			});
+		});
+
+		client.on("close", () => {
+			clearTimeout(timeout);
+
+			resolve({
+				success: true,
+				message: "TCP complete",
+				data: responses,
+			});
+		});
+	});
+}