C3.5.2.3 Command Update:
PM - Set MQTT Attributes
PM=6 - Set MQTT Keep-Alive time
status:	 new
format:	 PM=6,<0-65535 seconds>\r
default: 10 seconds


C3.5.2.1.BETA4 or above:
PE - Get Cerificate Set Availability
status: new
format: PE\r
output:	<Set 0, 0-used/1-available>,<Set 1, 0-used/1-available>,<Set 2, 0-used/1-available>
Note: Used will be reported if any one feature of the set is used.
 
format: PE=<certificate set 0/1/2>\r
output:	<CA, 0-used/1-available>,<Cert, 0-used/1-available>,<Key, 0-used/1-available>


PF - Set Active Certificate Set
status:	new
format:	PF=<function>,<certificate set>\r
		function: 			0=TLS, 1=AWS
		certificate set:	0-2

defaults:	TLS=0, AWS=2


PG - Program CA, Certificate, or Key
status:	new
format:	PG=<certificate set>,<type>,<len>\r<data bytes>
		certificate set:	0-2
		type:				0=CA, 1=Certificate, 2=Key
		len:				Length of CA, Certificate, or Key in bytes
		data bytes:			CA, Certificate, or Key bytes

C3.5.2.1.BETA4 or above
If you write the same CA, Certificate, or Key to the same location that the same
CA, Certificate, or Key was writen prior it will prefrom a verifiy. 
Output:	Match or an error.
		
				
PM - Show MQTT Attributes
status:	new
format: PM\r

output:	<publish topic>,<subscribe topic 0>,<subscribe topic 1>,<subscribe topic 2>,<MQTT mode>,<user name>,<password>,<client id>
		Note: if not set the field will be blank (ie, nothing between commas)


PM=0 - Set Publish Topic
status:	exsisting
format:	PM=0,<publish topic>\r
		publish topic:		64 alphanumeric characters

		
PM=1 - Set Subscribe Topic
status:	exsisting
format:	PM=1,<subscribe topic>\r
		subscribe topic:	64 alphanumeric characters
		Note: Only set index 0
		
status:	new, added
		PM=1,<index>,<subscribe topic>\r
		index:				0-2, 0 same as original format above
		subscribe topic:	64 alphanumeric characters

		
PM=2 - Set MQTT Security Mode
status:	exsisting
format:	PM=2,<security mode>\r
		security mode:		0=None 1=User Name/Password, 2=CA/Cert/Key

		
PM=3 - Set User Name
status:	exsisting
format:	PM=3,<user name>\r
		user name:			32 alphanumeric characters

		
PM=4 - Set User Name
status:	exsisting
format:	PM=4,<password>\r
		password:			32 alphanumeric characters

		
PM=5 - Set MQTT Client ID
status:	new
format:	PM=5,<client id>\r
		client_id			24 alphanumeric characters

		
PM command Clear Attribute
status:	new
format:	PM=<command>,''\r
		command:			0,1,3,4,5
		
format:	PM=<command>,<index>,''\r
		command:			1