Fix get command if ref already subscribed, document get

Author: vranki

README.md

@@ -3,7 +3,7 @@
 A plugin for X-Plane and other simulators that allows commanding the simulation from
 external programs through an easy-to-use TCP protocol.
 
-Current version 1002
+Current version 1003 (set in tcpserver.h, if you make changes!)
 
 ## Supported simulators ##
 
@@ -211,6 +211,7 @@ Commands and replies are sent as text strings as defined below.
 * **sub {dataref}:[modifiers] [accuracy]**   Subscribe to dataref, with optional accuracy.
 * **unsub {dataref}**                      Unsubscribe dataref.
 * **set {dataref} {value}**                Set dataref to value. Dataref must be subscribed first.
+* **get {dataref}**                        Get dataref value once, then unsubscribe.
 
 With accuracy you can decide how much the dataref's value can
 change before a update is sent. Set it to as large value as possible

extplane-server/tcpclient.cpp

@@ -109,15 +109,15 @@ void TcpClient::readClient() {
                             _refValueB[ref] = qobject_cast<DataDataRef*>(ref)->value();
                         }
                         INFO << "Subscribed to " << ref->name() << ", accuracy " << accuracy << ", type " << ref->typeString() << ", valid " << ref->isValid();
-                        if(ref->isValid()) {
-                            sendRef(ref); // Force update
-                        }
-                        if(command == "get") ref->setUnsubscribeAfterChange();
                     }
                 } else { // Ref already subscribed - update accuracy
                     INFO << "Updating " << refName << " accuracy to " << accuracy;
                     ref->setAccuracy(accuracy);
                 }
+                if(ref->isValid()) {
+                    sendRef(ref); // Force update
+                }
+                if(command == "get") ref->setUnsubscribeAfterChange();
             } else {
                 extplaneWarning(QString("Invalid sub command"));
             }

extplane-server/tcpserver.h

@@ -14,7 +14,7 @@
 // Network protocol, currently always 1
 #define EXTPLANE_PROTOCOL 1
 // Feature revision, every time we add a new feature or bug fix, this should be incremented so that clients can know how old the plugin is
-#define EXTPLANE_VERSION 1002
+#define EXTPLANE_VERSION 1003
 
 #define EXTPLANE_STRINGIFY(s) __EXTPLANE_STRINGIFY(s)
 #define __EXTPLANE_STRINGIFY(s) #s