diff --git a/src/controllers/installationController.js b/src/controllers/installationController.js
index e21c4fd8..2966daac 100644
--- a/src/controllers/installationController.js
+++ b/src/controllers/installationController.js
@@ -1038,14 +1038,12 @@ exports.getIotDataByCustomer = async (req, reply) => {
       return reply.code(400).send({ error: "customerId is required" });
     }
 
-    // 1. Fetch all insensors for this customer
     const sensors = await Insensors.find({ customerId });
 
     if (!sensors || sensors.length === 0) {
       return reply.code(404).send({ message: "No sensors found for this customer." });
     }
 
-    // 2. Get unique connected_to hardwareIds
     const hardwareIds = [
       ...new Set(
         sensors
@@ -1058,15 +1056,27 @@ exports.getIotDataByCustomer = async (req, reply) => {
       return reply.send({ status_code: 200, message: "No connected hardwareIds found", data: [] });
     }
 
-    // 3. Fetch latest record per hardwareId
     const latestDataPromises = hardwareIds.map(async hardwareId => {
       const latestRecord = await IotData.findOne({ hardwareId })
         .sort({ date: -1 })
         .lean();
 
+      // Determine the message based on tanks data
+      let message = "GSM is not connected";
+      if (latestRecord && Array.isArray(latestRecord.tanks)) {
+        const hasTankData = latestRecord.tanks.some(
+          tank => tank.tankHeight && parseFloat(tank.tankHeight) > 0
+        );
+        if (hasTankData) {
+          message = "GSM is connected";
+        }
+      }
+
       return {
         hardwareId,
-        latestRecord
+        message,
+        latestRecord,
+        
       };
     });
 
@@ -1085,3 +1095,4 @@ exports.getIotDataByCustomer = async (req, reply) => {
 };
 
 
+