minor fixed text and add screenshots

Author: stitenko

_includes/docs/pe/user-guide/integrations/index.md

@@ -224,7 +224,7 @@ Converter may also output array of device values and/or contain timestamps in th
 ##### Example
 
 Let's assume a complex example where payload is encoded in hex "value" field and there is a timestamp associated with each record. 
-First two bytes of "value" field contain battery and second two bytes contain temperature. See payload example and metadata on a screen shoot below:
+First two bytes of "value" field contain battery and second two bytes contain temperature. See payload example and metadata on a screen shoot below.
 
 {% include templates/tbel-vs-js.md %}
 

_includes/templates/integration/overview/uplink-data-converter-example-java.md

@@ -5,24 +5,22 @@ The full source code of javascript function used in converter:
 ```shell
 // decode payload to JSON
 var data = decodeToJson(payload);
-
 var result = [];
-
 for (var i in data){
-var report = data[i];
-var deviceName = report.serialNumber;
-var deviceType = metadata.deviceType;
-
+    var report = data[i];
+    var deviceName = report.serialNumber;
+    var deviceType = metadata.deviceType;
     var raw = report.value;
-
     var decoded = hexStringToByte(raw);
     // Result object with device attributes/telemetry data
     result.push({
         deviceName: deviceName,
         deviceType: deviceType,
-        attributes: { model: metadata.model},
+        attributes: { 
+            model: metadata.model
+        },
         telemetry: {
-            ts : report.timestamp,
+            ts: report.timestamp,
             values: {
                 battery: dataConverter(decoded, 0, 2, 100),
                 temperature: dataConverter(decoded, 2, 4, 100),
@@ -36,7 +34,7 @@ var deviceType = metadata.deviceType;
 /** Helper functions **/
 
 function decodeToString(payload) {
-return String.fromCharCode.apply(String, payload);
+    return String.fromCharCode.apply(String, payload);
 }
 
 function decodeToJson(payload) {

_includes/templates/integration/overview/uplink-data-converter-example-tbel.md

@@ -1,28 +1,26 @@
-![image](/images/user-guide/integrations/uplink-converter-example.png)
+![image](/images/user-guide/integrations/uplink-converter-example-tbel.png)
 
 The full source code of TBEL function used in converter:
 
 ```shell
 // decode payload to JSON
 var data = decodeToJson(payload);
-
 var result = [];
-
-for (var i in data){
-var report = data[i];
-var deviceName = report.serialNumber;
-var deviceType = metadata.deviceType;
-
+for (var i = 0; i < data.length; i++) {
+    var report = data[i];
+    var deviceName = report.serialNumber;
+    var deviceType = metadata.deviceType;
     var raw = report.value;
-
     var decoded = hexStringToByte(raw);
     // Result object with device attributes/telemetry data
     result.push({
         deviceName: deviceName,
         deviceType: deviceType,
-        attributes: { model: metadata.model},
+        attributes: {
+            model: metadata.model
+        },
         telemetry: {
-            ts : report.timestamp,
+            ts: report.timestamp,
             values: {
                 battery: dataConverter(decoded, 0, 2, 100),
                 temperature: dataConverter(decoded, 2, 4, 100),
@@ -36,44 +34,31 @@ var deviceType = metadata.deviceType;
 /** Helper functions **/
 
 function decodeToString(payload) {
-return String.fromCharCode.apply(String, payload);
-}
-
-function decodeToJson(payload) {
-// covert payload to string.
-var str = decodeToString(payload);
-
-    // parse string to JSON
-    var data = JSON.parse(str);
-    return data;
+    return String.fromCharCode.apply(String, payload);
 }
 
 function hexStringToByte(str) {
-if (!str) {
-return new Uint8Array();
-}
-
     var a = [];
-    for (var i = 0, len = str.length; i < len; i+=2) {
-        a.push(parseInt(str.substr(i,2),16));
+    if (str == null) {
+        return a;
     }
-
-    return new Uint8Array(a);
+    for (var j = 0; j < str.length; j += 2) {
+        a.push(parseInt(str.substring(j, j + 2), 16));
+    }
+    return a;
 }
 
 function dataConverter(decoded, byteIdxFrom, byteIdxTo, divided) {
-var bytes = decoded.subarray(byteIdxFrom, byteIdxTo);
-
+    // var bytes = decoded.subarray(byteIdxFrom, byteIdxTo);
     var val = 0;
-    for (var j = 0; j < bytes.length; j++) {
-        val += bytes[j];
-        if (j < bytes.length - 1) {
+    for (var j = byteIdxFrom; j < byteIdxTo; j++) {
+        val += decoded[j];
+        if (j < byteIdxTo - 1) {
             val = val << 8;
         }
     }
-    return val/divided;
+    return val / divided;
 }
-
 return result;
 ```
 {: .copy-code}