[shell]:Start CHIP event-loop by default during initialization. (#4185)

* Start CHIP event-loop by default during initialization.

* Add CHIP memory init during initialization

examples/shell/shell_common/cmd_device.cpp

@@ -53,21 +53,6 @@ int cmd_device_help(int argc, char ** argv)
     return 0;
 }
 
-int cmd_device_start(int argc, char ** argv)
-{
-    CHIP_ERROR error  = CHIP_NO_ERROR;
-    streamer_t * sout = streamer_get();
-
-    VerifyOrExit(argc == 0, error = CHIP_ERROR_INVALID_ARGUMENT);
-
-    streamer_printf(sout, "Starting Platform Manager Event Loop\r\n");
-    error = PlatformMgr().StartEventLoopTask();
-    SuccessOrExit(error);
-
-exit:
-    return error;
-}
-
 static CHIP_ERROR ConfigGetDone(streamer_t * sout, CHIP_ERROR error)
 {
     if (error)
@@ -925,7 +910,6 @@ static const shell_command_t cmds_device_root = { &cmd_device_dispatch, "device"
 /// Subcommands for root command: `device <subcommand>`
 static const shell_command_t cmds_device[] = {
     { &cmd_device_help, "help", "Usage: device <subcommand>" },
-    { &cmd_device_start, "start", "Start the device layer. Usage: device start" },
     { &cmd_device_get, "get", "Get configuration value. Usage: device get <param_name>" },
     { &cmd_device_config, "config", "Dump entire configuration of device. Usage: device config" },
 #if CHIP_DEVICE_CONFIG_ENABLE_THREAD
@@ -953,20 +937,25 @@ void cmd_device_init()
 
     streamer_t * sout = streamer_get();
 
+    error = chip::Platform::MemoryInit();
+    VerifyOrExit(error == CHIP_NO_ERROR,
+                 streamer_printf(sout, "Failed to init CHIP platform memory with error: %s\r\n", ErrorStr(error)));
+
     streamer_printf(sout, "Init CHIP Stack\r\n");
     error = PlatformMgr().InitChipStack();
-
-    if (error != CHIP_NO_ERROR)
-        streamer_printf(sout, "Failed to init CHIP Stack with error: %s\r\n", ErrorStr(error));
+    VerifyOrExit(error == CHIP_NO_ERROR, streamer_printf(sout, "Failed to init CHIP Stack with error: %s\r\n", ErrorStr(error)));
 
 #if CHIP_DEVICE_CONFIG_ENABLE_THREAD
     streamer_printf(sout, "Init Thread stack\r\n");
     error = ThreadStackMgr().InitThreadStack();
-    if (error != CHIP_NO_ERROR)
-    {
-        streamer_printf(sout, "ThreadStackMgr().InitThreadStack() failed\r\n");
-    }
+    VerifyOrExit(error == CHIP_NO_ERROR, streamer_printf(sout, "ThreadStackMgr().InitThreadStack() failed\r\n"));
 #endif
 
+    // Starting Platform Manager Event Loop;
+    error = PlatformMgr().StartEventLoopTask();
+    VerifyOrExit(error == CHIP_NO_ERROR, streamer_printf(sout, "Failed to start platform event loop\r\n"));
+
+exit:
+    return;
 #endif // CONFIG_DEVICE_LAYER
 }