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:
54:19d02b47e598
Parent:
26:f07f5febf97f
Child:
57:36e87c44c920
--- a/mbed_app.json	Thu May 16 12:01:57 2019 +0100
+++ b/mbed_app.json	Tue Jul 23 12:04:56 2019 +0100
@@ -235,6 +235,29 @@
             "lora-ant-switch":     "NC",
             "lora-pwr-amp-ctl":    "NC",
             "lora-tcxo":           "RF_TCXO_EN"
+        },
+
+        "IM880B": {
+            "main_stack_size":      1024,
+            "lora-radio":          "SX1272",
+            "lora-spi-mosi":       "SPI_RF_MOSI",
+            "lora-spi-miso":       "SPI_RF_MISO",
+            "lora-spi-sclk":       "SPI_RF_SCK",
+            "lora-cs":             "SPI_RF_NSS",
+            "lora-reset":          "SPI_RF_RESET",
+            "lora-dio0":           "DIO0",
+            "lora-dio1":           "DIO1",
+            "lora-dio2":           "DIO2",
+            "lora-dio3":           "DIO3",
+            "lora-dio4":           "DIO4",
+            "lora-dio5":           "NC",
+            "lora-rf-switch-ctl1": "NC",
+            "lora-rf-switch-ctl2": "NC",
+            "lora-txctl":          "ANT_CTX_PA",
+            "lora-rxctl":          "ANT_CRX_RX",
+            "lora-ant-switch":     "NC",
+            "lora-pwr-amp-ctl":    "NC",
+            "lora-tcxo":           "NC"
         }
     },
     "macros": ["MBEDTLS_USER_CONFIG_FILE=\"mbedtls_lora_config.h\""]