Intro¶

With the TDT-Protocol sensors can just send their values on the BUS.
An monitor-software should be able to display values without knowing about the sensors or their configuration.
The CANId of snesors is actually their configurable ID.
Sensor values are ususally not very important so they start at 0x200 (max ids 0x800);

Size	Decription	Examples
1	Sub-Id;	Futher index; Sub-Sensor or more specifi kind of thing to be set
1	Data type	Int, Float, Time, Date
1	Unit	Hz, °C, Time, Date, PWM-Percent, PWM-Promil, CAN-ID
4	Value	32Bit

Device behaviour¶

All devices should shut down after 5 hours when no master-heartbeat is received.

IDs, ranges and commands¶

CAN IDs¶

Range	Decription	Examples
0x010-0x0FF	Alarms	Devices have an issue
0x100-0x1FF	Control commands	Set global actuator
0x200-0x2FF	Sensors/actors fixed
0x300-0x6FF	Sensors/actors dynamic
0x6FF-0x7FF	Low priority boradcast	Power on devices

Global actuator¶

Global means that all actuators of an type is addressed and not one concrete partipiant.
An specific partipiant can be specified when sending the target CAN-Id in the value.
In this way the message is still high priority other than the "Remote Transmission Request"

ID	global actuator	Decription
0x100	System command	Perform system command; e.g. reboot, poweroff
0x101	Date/Time	Set date/time of all actuator
0x102	Illumination	Set brightness of lamps
0x103	Powerswitch	Power on devices
0x104	Plant watering pump	Automatically watering indoor plants

System commands¶

Sub-ID	Type
0x0	Shutdown
0x1	Heartbeat

Illumination commands¶

Sub-ID	Type
0x0	Set ambient light
0x1	Get ambient light
0x2	Set ambient light, fading
0x3	Get ambient light, fading
0x4	Set plant light
0x5	Get plant light

Powerswitch commands¶

Sub-ID	Type
0x0	Set multimedia
0x1	Get multimedia

Usecases¶

• simple actors can filter message to "Global actuator" messages, at least "system commands"
• There are 14 or 28 Filters on STM32Fs