解决的问题是，设备发来曝光模式变化信息后，本地能够正常处理，并反应到ui

src/domain/exam/paraSettingCoordinator.ts

@@ -124,7 +124,7 @@ class ParaSettingCoordinator {
 
   handleNewExposureMode(newValue) {
     // 将数字转换为字符串: 0 -> 'time', 1 -> 'mAs'
-    const mode = newValue === 0 ? 'time' : 'mAs';
+    const mode = newValue === '0' ? 'time' : 'mAs';
     console.info('有新的曝光模式从设备端到来。handleNewExposureMode', newValue, '转换为:', mode);
     this.dispatch({
       type: setExposureModeThunk.fulfilled.type,

src/domain/mqttServiceForDevice.ts

@@ -199,6 +199,15 @@ const startListening = () => {
       }
     });
 
+    mqttClient.subscribe(MQTT_TECHMODE, (err) => {
+      if (err) {
+        console.error(
+          '[mqttServiceForDevice] Failed to subscribe to topic MQTT_TECHMODE',
+          err
+        );
+      }
+    });
+
     mqttClient.subscribe(MQTT_ERRORLIST_NOTIFY, (err) => {
       if (err) {
         console.error(