mbed_app.json configured to operate on senet

To enable cayenne, edit mbed_app.json, assign pins for desired function

Example:

        "cayenne": {
            "help": "compile main_cayenne.cpp instead of main.cpp",
            "value": 1
        },
        "analog_in_pin": {
            "help": "PA_0, PA_4, PA_5",
            "value": "PA_0"
        },
        "analog_out_pin": {
            "help": "PA_0, PB_5, PB_10, PB_11",
            "value": "PB_11"
        },
        "_digital_out_pin": {
            "help": "",
            "value": ""
        }
Revision:
61:9a84b5964019
Parent:
56:39847849d219
--- a/main.cpp	Wed Apr 08 22:33:12 2020 +0000
+++ b/main.cpp	Mon May 04 03:05:28 2020 +0000
@@ -14,6 +14,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#ifndef MBED_CONF_APP_CAYENNE
+
 #include <stdio.h>
 
 #include "lorawan/LoRaWANInterface.h"
@@ -268,3 +270,4 @@
 }
 
 // EOF
+#endif /* MBED_CONF_APP_CAYENNE */
\ No newline at end of file