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:
21:41807073b52d
Parent:
13:2f387d100e5b
Child:
26:f07f5febf97f
--- a/mbed-lora-radio-drv.lib	Tue May 22 15:45:15 2018 +0100
+++ b/mbed-lora-radio-drv.lib	Fri May 25 08:00:14 2018 +0100
@@ -1,1 +1,1 @@
-https://github.com/ARMmbed/mbed-semtech-lora-rf-drivers#4691c37c6b2d0d4a013a0659f5770022e69a3c4a
+https://github.com/ARMmbed/mbed-semtech-lora-rf-drivers#c4dd25eec9ae30f9532e498ea7e2cacd758c733e