Dynamic Max Children (#462)

* Add support for dynamically adjusting the maximum number of allowed children.
* Update cli to support max number of children.

src/cli/README.md

@@ -10,6 +10,7 @@ OpenThread test scripts use the CLI to execute test cases.
 * [channel](#channel)
 * [blacklist](#blacklist)
 * [child](#child)
+* [childmax](#childmax)
 * [childtimeout](#childtimeout)
 * [contextreusedelay](#contextreusedelay)
 * [counter](#counter)
@@ -154,6 +155,25 @@ RSSI: -20
 Done
 ```
 
+### childmax
+
+Get the Thread maximum number of allowed children.
+
+```bash
+> childmax
+5
+Done
+```
+
+### childmax \<count\>
+
+Set the Thread maximum number of allowed children.
+
+```bash
+> childmax 2
+Done
+```
+
 ### childtimeout
 
 Get the Thread Child Timeout value.

src/cli/cli.cpp

@@ -57,6 +57,7 @@ const struct Command Interpreter::sCommands[] =
     { "blacklist", &ProcessBlacklist },
     { "channel", &ProcessChannel },
     { "child", &ProcessChild },
+    { "childmax", &ProcessChildMax },
     { "childtimeout", &ProcessChildTimeout },
     { "contextreusedelay", &ProcessContextIdReuseDelay },
     { "counter", &ProcessCounters },
@@ -380,6 +381,25 @@ exit:
     AppendResult(error);
 }
 
+void Interpreter::ProcessChildMax(int argc, char *argv[])
+{
+    ThreadError error = kThreadError_None;
+    long value;
+
+    if (argc == 0)
+    {
+        sServer->OutputFormat("%d\r\n", otGetMaxAllowedChildren());
+    }
+    else
+    {
+        SuccessOrExit(error = ParseLong(argv[0], value));
+        SuccessOrExit(error = otSetMaxAllowedChildren(static_cast<uint8_t>(value)));
+    }
+
+exit:
+    AppendResult(error);
+}
+
 void Interpreter::ProcessChildTimeout(int argc, char *argv[])
 {
     ThreadError error = kThreadError_None;

src/cli/cli.hpp

@@ -134,6 +134,7 @@ private:
     static void ProcessChannel(int argc, char *argv[]);
     static void ProcessChild(int argc, char *argv[]);
     static void ProcessChildTimeout(int argc, char *argv[]);
+    static void ProcessChildMax(int argc, char *argv[]);
     static void ProcessContextIdReuseDelay(int argc, char *argv[]);
     static void ProcessCounters(int argc, char *argv[]);
     static void ProcessDataset(int argc, char *argv[]);