cannot change property value at run time using telnet set command

[pbecchi]

I try to modify property value at run time using an external TELNET command but the actual value dont change.

Having added to model XML file this line:
<input type="SOCKET" port="1155"/>
I can succesfully connect with a telnet session: telnet localhost 1155
I can get property values by the get \property\ command , but if i try the command :set \property\ new value I get a set successfull answer but the property value is not modified.
Regardless where JSBSim is running or is on hold , the property value never change.
I dont understand what i am doing wrong. Can somebody help me?

[seanmcleod]

What property are you trying to set? Have you confimed that it isn't a read-only property?

JSBSim.exe --aircraft=737 --catalog`

  Property Catalog for 737

    inertial/sea-level-radius_ft (R)
    simulation/gravity-model (RW)
    simulation/integrator/rate/rotational (RW)
    simulation/integrator/rate/translational (RW)
    simulation/integrator/position/rotational (RW)
    simulation/integrator/position/translational (RW)
    simulation/write-state-file (W)
    simulation/channel-dt (R)
    simulation/gravitational-torque (RW)
    simulation/force-output (W)
    simulation/do_simple_trim (W)
    simulation/reset (W)
    simulation/disperse (R)
    simulation/randomseed (RW)
    simulation/terminate (RW)
    simulation/pause (RW)
    simulation/sim-time-sec (R)
    simulation/dt (R)

[pbecchi]

Thanks for your fast answer -:).
I try to change the properties related to local wind , like atmosphere/psiw-rad that should be RW.
This is what i get:
`JSBSim> iterate 1

Iterations performed

JSBSim> set atmosphere/psiw-rad 1

set successful

JSBSim> get atmosphere/psiw-rad

atmosphere/psiw-rad = 0

JSBSim> iterate 1

Iterations performed

JSBSim> get atmosphere/psiw-rad

atmosphere/psiw-rad = 0

JSBSim> resume

Resuming

JSBSim> set atmosphere/psiw-rad 0.5

set successful

JSBSim> get atmosphere/psiw-rad

atmosphere/psiw-rad = 0`

[seanmcleod]

Have you set a wind speed? While updating atmosphere/psiw-rad the SetWindSpeed() method is called.

jsbsim/src/models/atmosphere/FGWinds.cpp

Lines 183 to 190 in 9cb22d7

	// psi is the angle that the wind is blowing *towards*
	void FGWinds::SetWindPsi(double dir)
	{
	double mag = GetWindspeed();
	psiw = dir;
	SetWindspeed(mag);
	}

And psiw can be reset to 0 in SetWindSpeed().

jsbsim/src/models/atmosphere/FGWinds.cpp

Lines 162 to 172 in 9cb22d7

	void FGWinds::SetWindspeed(double speed)
	{
	if (vWindNED.Magnitude() == 0.0) {
	psiw = 0.0;
	vWindNED(eNorth) = speed;
	} else {
	vWindNED(eNorth) = speed * cos(psiw);
	vWindNED(eEast) = speed * sin(psiw);
	vWindNED(eDown) = 0.0;
	}
	}

[pbecchi]

It works now:

JSBSim> set atmosphere/wind-mag-fps 10
set successful
JSBSim> get atmosphere/wind-mag-fps
atmosphere/wind-mag-fps = 10
JSBSim> set atmosphere/psiw-rad 0.5
set successful
JSBSim> get atmosphere/psiw-rad
atmosphere/psiw-rad = 0.5

Now I can change wind speed and direction during simulation! -:) Thanks so much!