Sending via UDP, setting DREF to a Value

Question

Hi,

I'm setting up an encoder panel to control radios, etc.  I'm testing the commands with a Packet Sender program, and am able to control the functions with the CMND function.  For example, CMND+sim/autopilot/altitude_up from the Packet Sender converts the ASCII to hex and causes the altitude setting to increase in the sim.  Notice I took the 0 after D out to make it work. (Documentation states: CMND0+sim/flight_controls/flaps_up)

The documentation/syntax (D:\X-Plane 11\Instructions\X-Plane SPECS from Austin\Exchanging Data with X-Plane.rtfd\TXT.rtf) is unclear to me for the DREF command:

DREF0+(4byte byte value of 1)+ sim/cockpit/switches/anti_ice_surf_heat_left+0+spaces to complete to 509 bytes

Assuming I only want to use datarefs with a value of 0 or 1, and I wanted to set night vision on, the resulting syntax doesn't seem to work:

DREF0(????)sim/cockpit/electrical/night_vision_on0

[followed by enough spaces to get to 504 bytes, which differs from documentation stating 509 bytes].  

I believe my difficulty is the piece I've notated with the question marks.  The 4-byte byte value for 1, and whether parentheses or spaces are needed around it, or commas/dashes between.

I would appreciate clarification if someone has it, i.e., a statement that works in the Packet Sender, and later in an Arduino program.

Thank You,  RF

Answer 1

I resolved this.

Correct ASCII syntax for night vision off is "DREF\00\00\00\00\00sim/cockpit/electrical/night_vision_on\00", padded with spaces out to 504 bytes (+ DREF0 = 509 bytes).

This translates to:  44 52 45 46 00 00 00 00 00 73 69 6d 2f 63 6f 63 6b 70 69 74 2f 65 6c 65 63 74 72 69 63 61 6c 2f 6e 69 67 68 74 5f 76 69 73 69 6f 6e 5f 6f 6e 00 (padded with spaces 20 20 20 etc. to 504 bytes).

Night vision on:  44 52 45 46 00 00 00 80 3f 73 69 6d 2f 63 6f 63 6b 70 69 74 2f 65 6c 65 63 74 72 69 63 61 6c 2f 6e 69 67 68 74 5f 76 69 73 69 6f 6e 5f 6f 6e 00 (padded with spaces 20 20 20 etc. to 504 bytes).