Revert "refactor: change command client method visibility to ease extension"

This reverts commit e1eef36.

Author: matey97

wearossensors/src/main/java/es/uji/geotec/wearossensors/command/CommandClient.java

@@ -38,7 +38,7 @@ public void sendStopCommand(Sensor sensor) {
         sendCommand("stop-" + sensor.toString().toLowerCase());
     }
 
-    protected void sendCommand(String commandName, int sensorDelay, int batchSize) {
+    private void sendCommand(String commandName, int sensorDelay, int batchSize) {
         String command = commandFromParameters(commandName, sensorDelay, batchSize);
         sendCommand(command);
     }