Update README.md

Author: deepcoder

README.md

@@ -15,13 +15,15 @@ The program uses the bluetooth and mqtt client libraries, steps to image Raspber
 
 To compile:
 
+```
 gcc -o ble_sensor_mqtt_pub ble_sensor_mqtt_pub.c -lbluetooth  -l paho-mqtt3c
 
+```
 To run:
 ```
 sudo ble_sensor_mqtt_pub <bluetooth adapter> <scan type> <scan window> <scan interval>
 
-bluetooth adapter = integer number of bluetooth devices, run hciconfig to see your adapters, 1st adapter is 0, so hci1 is 0
+bluetooth adapter = integer number of bluetooth devices, run hciconfig to see your adapters, 1st adapter is referenced as 0 in this program
 scan type = 0 for passive, 1 for active advertising scan, some BLE sensors only share data on type 4 response active advertising packets
 scan window = integer number that is multiplied by 0.625 to set advertising scanning window in milliseconds. Try 100 to start.
 scan interval = integer number that is multiplied by 0.625 to set advertising scanning interval in milliseconds. Try 1000 to start.