Media Gateway Can

Field name	Description	Type
`mgwcan`	`Media Gateway CAN`	`No value (only supports checking if file exists or not)`
`mgwcan.version`	`Version`	`Unsigned Integer, 1 byte`
`mgwcan.port`	`Port`	`No value (only supports checking if file exists or not)`
`can.id`	`ID`	`Unsigned Integer, 4 byte`
`can.id_type`	`Id Type`	`Signed/Unsigned Integer Value`
`can.frame_type`	`Frame Type`	`Signed/Unsigned Integer Value`
`can.length`	`DLC`	`Unsigned Integer, 1 byte`
`can.payload`	`Payload`	`String of hexadecimal bytes`
`can`	`CAN`	`No value (only supports checking if file exists or not)`