diff --git a/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs b/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs
index 1a2f43d..42e12d6 100644
--- a/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs
+++ b/YD_AllHeartRates.Api/Mqtt/MqttBackgroundService.cs
@@ -84,56 +84,58 @@ namespace YD_AllHeartRates.Api.Mqtt
                 return _queue.Writer.WriteAsync(msg, stoppingToken).AsTask();
             };
 
+            List<StudentDto> studentList;
+            List<S_Device> devices;
+
+            var studentListCacheKey = $"{AppSettings.StudentListCacheKey}_{AppSettings.SchoolCode}";
+            var deviceListCacheKey = $"{AppSettings.DeviceListCacheKey}_{AppSettings.SchoolCode}";
+
+            studentList = _caching.Get<List<StudentDto>>(studentListCacheKey);
+            devices = _caching.Get<List<S_Device>>(deviceListCacheKey);
+
+            if (studentList == null || devices == null)
+            {
+                studentList = (
+                   from s in _smartSportsContext.Student
+                   join c in _smartSportsContext.Class on s.ClassId equals c.Id
+                   join d in _smartSportsContext.Device on s.StudentNo equals d.StudentNo into sd
+                   from d in sd.DefaultIfEmpty()
+                   where s.SchoolCode == AppSettings.SchoolCode && s.StudentStatus == 1
+                   select new StudentDto
+                   {
+                       SchoolCode = s.SchoolCode,
+                       StudentNo = s.StudentNo,
+                       StudentName = s.StudentName,
+                       Sex = s.Sex,
+                       Age = s.Age,
+                       HeartRateId = d != null ? d.Code : "",
+                       JumpRopeId = d != null ? d.Code : "",
+                       ClassId = s.ClassId,
+                       ClassName = s.ClassName,
+                       GradeId = c.GradeId,
+                       GradeName = c.GradeName ?? "",
+                       DeviceType = d != null ? d.DeviceType : 0
+                   }
+               ).ToList();
+
+
+                devices = _smartSportsContext.Device.Where(x => x.SchoolCode == AppSettings.SchoolCode && !string.IsNullOrWhiteSpace(x.StudentNo)).ToList();
+
+                _caching.AddObject(studentListCacheKey, studentList, 600);
+                _caching.AddObject(deviceListCacheKey, devices, 600);
+            }
+
+            var heartRateEntities = new ConcurrentBag<HeartRateData>();
+            var jumpRopeEntities = new ConcurrentBag<JumpRopeData>();
+
+            var deviceHMap = devices.Where(x => x.DeviceType == 1).ToDictionary(x => x.Code, x => x.StudentNo);
+            var deviceJMap = devices.Where(x => x.DeviceType == 2).ToDictionary(x => x.Code, x => x.StudentNo);
+
+            var studentMap = studentList.GroupBy(x => x.StudentNo).ToDictionary(g => g.Key, g => g.First());
+
+
             await foreach (var batch in ReadBatchesAsync(stoppingToken))
             {
-                List<StudentDto> studentList;
-                List<S_Device> devices;
-
-                var studentListCacheKey = $"{AppSettings.StudentListCacheKey}_{AppSettings.SchoolCode}";
-                var deviceListCacheKey = $"{AppSettings.DeviceListCacheKey}_{AppSettings.SchoolCode}";
-
-                studentList = _caching.Get<List<StudentDto>>(studentListCacheKey);
-                devices = _caching.Get<List<S_Device>>(deviceListCacheKey);
-
-                if (studentList == null || devices == null)
-                {
-                    studentList = (
-                       from s in _smartSportsContext.Student
-                       join c in _smartSportsContext.Class on s.ClassId equals c.Id
-                       join d in _smartSportsContext.Device on s.StudentNo equals d.StudentNo into sd
-                       from d in sd.DefaultIfEmpty()
-                       where s.SchoolCode == AppSettings.SchoolCode && s.StudentStatus == 1
-                       select new StudentDto
-                       {
-                           SchoolCode = s.SchoolCode,
-                           StudentNo = s.StudentNo,
-                           StudentName = s.StudentName,
-                           Sex = s.Sex,
-                           Age = s.Age,
-                           HeartRateId = d != null ? d.Code : "",
-                           JumpRopeId = d != null ? d.Code : "",
-                           ClassId = s.ClassId,
-                           ClassName = s.ClassName,
-                           GradeId = c.GradeId,
-                           GradeName = c.GradeName ?? "",
-                           DeviceType = d != null ? d.DeviceType : 0
-                       }
-                   ).ToList();
-
-
-                    devices = _smartSportsContext.Device.Where(x => x.SchoolCode == AppSettings.SchoolCode && !string.IsNullOrWhiteSpace(x.StudentNo)).ToList();
-
-                    _caching.AddObject(studentListCacheKey, studentList, 600);
-                    _caching.AddObject(deviceListCacheKey, devices, 600);
-                }
-
-                var heartRateEntities = new ConcurrentBag<HeartRateData>();
-                var jumpRopeEntities = new ConcurrentBag<JumpRopeData>();
-
-                var deviceHMap = devices.Where(x => x.DeviceType == 1).ToDictionary(x => x.Code, x => x.StudentNo);
-                var deviceJMap = devices.Where(x => x.DeviceType == 2).ToDictionary(x => x.Code, x => x.StudentNo);
-
-                var studentMap = studentList.GroupBy(x => x.StudentNo).ToDictionary(g => g.Key, g => g.First());
 
                 Parallel.ForEach(batch, new ParallelOptions { MaxDegreeOfParallelism = Environment.ProcessorCount }, msg =>
                 {
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfo.cs b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfo.cs
index 5236787..336ae75 100644
--- a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfo.cs
+++ b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfo.cs
@@ -14,7 +14,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("YD_AllHeartRates.Api")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+4af2ed6c7dde8915d38199959dc15eb0626ad29e")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+a15af967e2dd98f88c113b78a7bd304a4d3c0593")]
 [assembly: System.Reflection.AssemblyProductAttribute("YD_AllHeartRates.Api")]
 [assembly: System.Reflection.AssemblyTitleAttribute("YD_AllHeartRates.Api")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfoInputs.cache b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfoInputs.cache
index 2618ff6..47a2061 100644
--- a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfoInputs.cache
+++ b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.AssemblyInfoInputs.cache
@@ -1 +1 @@
-beaa3e786d777e801e865749bc1ed887c9c8bed6062702fc86efc5e999ecbaef
+22e8205ab6b5676d7d793a438db64102c980db506ddb7d0babd8c83fd38fab3a
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.csproj.CoreCompileInputs.cache b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.csproj.CoreCompileInputs.cache
index 155c4f2..782a37c 100644
--- a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.csproj.CoreCompileInputs.cache
+++ b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.csproj.CoreCompileInputs.cache
@@ -1 +1 @@
-5f7fb39ffdbe64b582eda15bdc00418a6579ad165c38355ff639a59366e2f9f7
+9b82f68e122f7768a48d83e21fcb65980b61db40f12686a3b3daf32153b4fa35
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.dll b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.dll
index 30da94d..f3464af 100644
Binary files a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.dll and b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.dll differ
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.pdb b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.pdb
index b3824c3..7eb93ca 100644
Binary files a/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.pdb and b/YD_AllHeartRates.Api/obj/Debug/net6.0/YD_AllHeartRates.Api.pdb differ
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/apphost.exe b/YD_AllHeartRates.Api/obj/Debug/net6.0/apphost.exe
index f384e24..fb2d676 100644
Binary files a/YD_AllHeartRates.Api/obj/Debug/net6.0/apphost.exe and b/YD_AllHeartRates.Api/obj/Debug/net6.0/apphost.exe differ
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/ref/YD_AllHeartRates.Api.dll b/YD_AllHeartRates.Api/obj/Debug/net6.0/ref/YD_AllHeartRates.Api.dll
index 28aa0dc..a72f20b 100644
Binary files a/YD_AllHeartRates.Api/obj/Debug/net6.0/ref/YD_AllHeartRates.Api.dll and b/YD_AllHeartRates.Api/obj/Debug/net6.0/ref/YD_AllHeartRates.Api.dll differ
diff --git a/YD_AllHeartRates.Api/obj/Debug/net6.0/refint/YD_AllHeartRates.Api.dll b/YD_AllHeartRates.Api/obj/Debug/net6.0/refint/YD_AllHeartRates.Api.dll
index 28aa0dc..a72f20b 100644
Binary files a/YD_AllHeartRates.Api/obj/Debug/net6.0/refint/YD_AllHeartRates.Api.dll and b/YD_AllHeartRates.Api/obj/Debug/net6.0/refint/YD_AllHeartRates.Api.dll differ