From 4ba8f0fdfd2fdeafc7ef35b2a9d700beb8284472 Mon Sep 17 00:00:00 2001
From: sige <sige@sige.com>
Date: Sat, 23 Mar 2024 17:53:39 +0800
Subject: [PATCH] ~

---
 .../graphiteDigesterBg/diframe/connection/DiConModbusRTUOverTCP.java   | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/src/main/java/com/my/graphiteDigesterBg/diframe/connection/DiConModbusRTUOverTCP.java b/src/src/main/java/com/my/graphiteDigesterBg/diframe/connection/DiConModbusRTUOverTCP.java
index 98ee6e8..37f9d92 100644
--- a/src/src/main/java/com/my/graphiteDigesterBg/diframe/connection/DiConModbusRTUOverTCP.java
+++ b/src/src/main/java/com/my/graphiteDigesterBg/diframe/connection/DiConModbusRTUOverTCP.java
@@ -71,6 +71,9 @@ public class DiConModbusRTUOverTCP {
         cmd[4] = 0x00; // value high
         cmd[5] = 0x01; // value low
         var response = this.call(cmd);
+        if (response.isEmpty()) {
+            throw new RuntimeException("Modbus RTU over TCP: no response");
+        }
         return response.get(3) << 8 | response.get(4);
     }