diff --git a/lib/ulParser.js b/lib/ulParser.js
index e3c62453..74aa817f 100644
--- a/lib/ulParser.js
+++ b/lib/ulParser.js
@@ -61,7 +61,12 @@ function addAttributePair(collection, pair) {
     if (!pair || pair.length !== 2) {
         throw new errors.ParseError('Extracting attribute:' + JSON.stringify(pair));
     } else {
-        collection[pair[0]] = pair[1];
+        try {
+            collection[pair[0]] = JSON.parse(pair[1]);
+        } catch (e) {
+            collection[pair[0]] = pair[1];
+        }
+
         return collection;
     }
 }
@@ -107,7 +112,7 @@ function parseMeasure(group, numberOfBars) {
         if (timestamp) {
             returnValue[constants.TIMESTAMP_ATTRIBUTE] = timestamp;
         }
-
+        config.getLogger().debug(context, 'parseMeasure %j', returnValue);
         return returnValue;
     }
 }
@@ -277,17 +282,17 @@ function serializedPayloadCommand(payload, command) {
  */
 function createCommandPayload(device, command, attributes) {
     function addAttributes(current, key) {
-        let cmd = device && device.commands.find((att) => att.name === current.split('@')[1]);
+        const cmd = device && device.commands.find((att) => att.name === current.split('@')[1]);
         let value = attributes[key];
         if (cmd && cmd.expression) {
-            let parser = iotAgentLib.dataPlugins.expressionTransformation;
+            const parser = iotAgentLib.dataPlugins.expressionTransformation;
             // The context for the JEXL expression should be the ID, TYPE, S, SS
             let attrList = iotAgentLib.dataPlugins.utils.getIdTypeServSubServiceFromDevice(device);
             attrList = device.staticAttributes
                 ? attrList.concat(device.staticAttributes).concat({ key: value })
                 : attrList.concat({ key: value });
             config.getLogger().debug(context, 'attrList [%j] for device %j', attrList, device);
-            let ctxt = parser.extractContext(attrList, device);
+            const ctxt = parser.extractContext(attrList, device);
             let valueRes = null;
             try {
                 valueRes = parser.applyExpression(cmd.expression, ctxt, device);
@@ -303,16 +308,16 @@ function createCommandPayload(device, command, attributes) {
     if (typeof attributes === 'object') {
         return Object.keys(attributes).reduce(addAttributes, device.id + '@' + command, command);
     }
-    let cmd = device && device.commands.find((att) => att.name === command);
+    const cmd = device && device.commands.find((att) => att.name === command);
     if (cmd && cmd.expression) {
-        let parser = iotAgentLib.dataPlugins.expressionTransformation;
+        const parser = iotAgentLib.dataPlugins.expressionTransformation;
         // The context for the JEXL expression should be the ID, TYPE, S, SS
         let attrList = iotAgentLib.dataPlugins.utils.getIdTypeServSubServiceFromDevice(device);
         attrList = device.staticAttributes
             ? attrList.concat(device.staticAttributes).concat({ command: attributes })
             : attrList.concat({ command: attributes });
         config.getLogger().debug(context, 'attrList [%j] for device %j', attrList, device);
-        let ctxt = parser.extractContext(attrList, device);
+        const ctxt = parser.extractContext(attrList, device);
         let valueRes = null;
         try {
             valueRes = parser.applyExpression(cmd.expression, ctxt, device);
@@ -321,7 +326,7 @@ function createCommandPayload(device, command, attributes) {
         }
         attributes = valueRes ? valueRes : cmd.expression;
     }
-    let payload = device.id + '@' + command + '|' + attributes;
+    const payload = device.id + '@' + command + '|' + attributes;
     return serializedPayloadCommand(payload, cmd);
 }