[cli] support energy scan command (#3036)

src/cli/README.md

@@ -64,7 +64,7 @@ OpenThread test scripts use the CLI to execute test cases.
 * [routerrole](#routerrole)
 * [routerselectionjitter](#routerselectionjitter)
 * [routerupgradethreshold](#routerupgradethreshold)
-* [scan](#scan-channel)
+* [scan](#scan)
 * [singleton](#singleton)
 * [state](#state)
 * [thread](#thread-start)
@@ -1592,6 +1592,35 @@ Perform an IEEE 802.15.4 Active Scan.
 Done
 ```
 
+### scan energy \[duration\]
+
+Perform an IEEE 802.15.4 Energy Scan.
+
+* duration: The time in milliseconds to spend scanning each channel.
+
+```bash
+> scan energy 10
+| Ch | RSSI |
++----+------+
+| 11 |  -59 |
+| 12 |  -62 |
+| 13 |  -67 |
+| 14 |  -61 |
+| 15 |  -87 |
+| 16 |  -86 |
+| 17 |  -86 |
+| 18 |  -52 |
+| 19 |  -58 |
+| 20 |  -82 |
+| 21 |  -76 |
+| 22 |  -82 |
+| 23 |  -74 |
+| 24 |  -81 |
+| 25 |  -88 |
+| 26 |  -71 |
+Done
+```
+
 ### singleton
 Return true when there are no other nodes in the network, otherwise return false.
 

src/cli/cli.cpp

@@ -2570,17 +2570,45 @@ void Interpreter::ProcessScan(int argc, char *argv[])
 {
     otError  error        = OT_ERROR_NONE;
     uint32_t scanChannels = 0;
+    uint16_t scanDuration = 0;
+    bool     energyScan   = false;
     long     value;
 
     if (argc > 0)
     {
-        SuccessOrExit(error = ParseLong(argv[0], value));
-        scanChannels = 1 << value;
+        if (strcmp(argv[0], "energy") == 0)
+        {
+            energyScan = true;
+
+            if (argc > 1)
+            {
+                SuccessOrExit(error = ParseLong(argv[1], value));
+                scanDuration = static_cast<uint16_t>(value);
+            }
+        }
+        else
+        {
+            SuccessOrExit(error = ParseLong(argv[0], value));
+            scanChannels = 1 << value;
+        }
     }
 
-    mServer->OutputFormat("| J | Network Name     | Extended PAN     | PAN  | MAC Address      | Ch | dBm | LQI |\r\n");
-    mServer->OutputFormat("+---+------------------+------------------+------+------------------+----+-----+-----+\r\n");
-    SuccessOrExit(error = otLinkActiveScan(mInstance, scanChannels, 0, &Interpreter::s_HandleActiveScanResult, this));
+    if (energyScan)
+    {
+        mServer->OutputFormat("| Ch | RSSI |\r\n");
+        mServer->OutputFormat("+----+------+\r\n");
+        SuccessOrExit(error = otLinkEnergyScan(mInstance, scanChannels, scanDuration,
+                                               &Interpreter::s_HandleEnergyScanResult, this));
+    }
+    else
+    {
+        mServer->OutputFormat(
+            "| J | Network Name     | Extended PAN     | PAN  | MAC Address      | Ch | dBm | LQI |\r\n");
+        mServer->OutputFormat(
+            "+---+------------------+------------------+------+------------------+----+-----+-----+\r\n");
+        SuccessOrExit(error = otLinkActiveScan(mInstance, scanChannels, scanDuration,
+                                               &Interpreter::s_HandleActiveScanResult, this));
+    }
 
     return;
 
@@ -2619,6 +2647,25 @@ exit:
     return;
 }
 
+void OTCALL Interpreter::s_HandleEnergyScanResult(otEnergyScanResult *aResult, void *aContext)
+{
+    static_cast<Interpreter *>(aContext)->HandleEnergyScanResult(aResult);
+}
+
+void Interpreter::HandleEnergyScanResult(otEnergyScanResult *aResult)
+{
+    if (aResult == NULL)
+    {
+        mServer->OutputFormat("Done\r\n");
+        ExitNow();
+    }
+
+    mServer->OutputFormat("| %2d | %4d |\r\n", aResult->mChannel, aResult->mMaxRssi);
+
+exit:
+    return;
+}
+
 void Interpreter::ProcessSingleton(int argc, char *argv[])
 {
     otError error = OT_ERROR_NONE;

src/cli/cli.hpp

@@ -332,6 +332,7 @@ private:
     static void s_HandlePingTimer(Timer &aTimer);
 #endif
     static void OTCALL s_HandleActiveScanResult(otActiveScanResult *aResult, void *aContext);
+    static void OTCALL s_HandleEnergyScanResult(otEnergyScanResult *aResult, void *aContext);
     static void OTCALL s_HandleNetifStateChanged(otChangedFlags aFlags, void *aContext);
 #ifndef OTDLL
     static void s_HandleLinkPcapReceive(const otRadioFrame *aFrame, void *aContext);
@@ -361,6 +362,7 @@ private:
     void HandlePingTimer();
 #endif
     void HandleActiveScanResult(otActiveScanResult *aResult);
+    void HandleEnergyScanResult(otEnergyScanResult *aResult);
 #ifdef OTDLL
     void HandleNetifStateChanged(otInstance *aInstance, otChangedFlags aFlags);
 #else