Add txpowermax CLI (#1775)

src/cli/README.md

@@ -63,6 +63,7 @@ OpenThread test scripts use the CLI to execute test cases.
 * [singleton](#singleton)
 * [state](#state)
 * [thread](#thread-start)
+* [txpowermax](#txpowermax)
 * [version](#version)
 * [whitelist](#whitelist)
 * [diag](#diag)
@@ -1566,6 +1567,25 @@ Disable Thread protocol operation and detach from a Thread network.
 Done
 ```
 
+### txpowermax
+
+Get the maximum transmit power in dBm.
+
+```bash
+> txpowermax
+-10 dBm
+Done
+```
+
+### txpowermax \<txpowermax\>
+
+Set the maximum transmit power.
+
+```bash
+> txpowermax -10
+Done
+```
+
 ### version
 
 Print the build version information.

src/cli/cli.cpp

@@ -188,6 +188,7 @@ const struct Command Interpreter::sCommands[] =
     { "singleton", &Interpreter::ProcessSingleton },
     { "state", &Interpreter::ProcessState },
     { "thread", &Interpreter::ProcessThread },
+    { "txpowermax", &Interpreter::ProcessTxPowerMax },
     { "version", &Interpreter::ProcessVersion },
     { "whitelist", &Interpreter::ProcessWhitelist },
 };
@@ -2495,6 +2496,25 @@ exit:
     AppendResult(error);
 }
 
+void Interpreter::ProcessTxPowerMax(int argc, char *argv[])
+{
+    ThreadError error = kThreadError_None;
+    long value;
+
+    if (argc == 0)
+    {
+        sServer->OutputFormat("%d dBm\r\n", otLinkGetMaxTransmitPower(mInstance));
+    }
+    else
+    {
+        SuccessOrExit(error = ParseLong(argv[0], value));
+        otLinkSetMaxTransmitPower(mInstance, static_cast<int8_t>(value));
+    }
+
+exit:
+    AppendResult(error);
+}
+
 void Interpreter::ProcessVersion(int argc, char *argv[])
 {
     otStringPtr version(otGetVersionString());

src/cli/cli.hpp

@@ -263,6 +263,7 @@ private:
     void ProcessSingleton(int argc, char *argv[]);
     void ProcessState(int argc, char *argv[]);
     void ProcessThread(int argc, char *argv[]);
+    void ProcessTxPowerMax(int argc, char *argv[]);
     void ProcessVersion(int argc, char *argv[]);
     void ProcessWhitelist(int argc, char *argv[]);