rev43
1.reset co2 module if reading wrong data

rev42
add default offset for PM2.5 4-20mA output

rev41
1.fixed pm2.5 calibration function for sensirion sensor
2.re-arrange the task priority, current system only have 6 priorities, so before 7,8 priority dose not work real.
need to test if still have restart issue sometimes.

rev40
modify hum sensor communication, make it slower (10 times) 
modify the hum calibration function, one point will use offset, more than two points use multiple points method. 
fix sub netmask 

rev39
modify the CO2 filter for spike and co2;
modify co2 module  detect function.  
fix bug that will always write EEPROM in COM task.

rev36
1. add dealing with ip confilct from T3000
2. change SilenceTime to 5000 for bacnet MSTP to solve when  device ID > 50 , MSTP dose not work issue.

rev35
add ptransfer function for bacnet to modbus
fixed co2 product restart issue
rev34
debug version for co2 restart problem
rev33
add new humidity sensor SHT3X
rev32
modify device name,before only co2 product can write name.
add new hum sensor sht3x support
add pressure product nmae on reg900 to reg908
change display item "Modbus ID" to "Device ID"

rev31
fixed product name for co2,pressure,pm25
rev30
1.change light sensor calibration
2.fixed analog output manual mode bug

rev28:
1. fix the bug that parity is always 0. exist this problem since rev24 to rev27

RE27
created by chelsea
1. update latest bacnet library, support muti-read.
2. fix bacnet base to 0. 

//Rev26
//change the bacnet.

//Rev25
//add analog output for the pm2.5

//Rev24
//Merge the co2 \ hum \ pressure 
//add the pm2.5 sensor
//change the bacnet input ,output and variable
//add the sleep command for the PM2.5 sensor
//add pressure manu mode
//the stand i/o can work now
 //add analog output for the pm2.5



//Rev23
//fix the output offset
//When a modbus device receives a request on address 00,it isn¡¯t supposed to respond.

//Rev22
//the back light timer can be changed.
//fix the temperature is not stable when it is on the zero.

//Rev21
//fix the dhcp

//Rev20
//change the watch dog timer

//Rev19
//add the auto heating function
//change the read humidity ways(in order to remove the ist temperature compensation from the humidity sensor).

//Rev18
//add filter to read the humidity input
//change the read humidity task timer

//Rev17
//change the bacnet variables
//fix the mstp bug


//Rev16
//change the pid
//change the Mstp


//Rev15
//add the pid setting.
//add parity setting for hum.

//Rev14
//fix the eep

//Rev13
//fix the uart communication bug
//fix the scan communication bug
//fix the hum-w baudrate set bug

//Rev12
//adjust the pressure analog output channel
// fix the minus range setting


//Rev11
//add mbpoll receive and reply delay timer
//disabble rtc function when product id is hum

//Rev10
//co2_rs485 and hum_rs485