Add README file to the Nextion_ON7LDS directory

Nextion displays: Do not change colors or show TA when ScreenLayout is not ON7LDS

Nextion.cpp

@@ -344,6 +344,8 @@ void CNextion::writeDMRTAInt(unsigned int slotNo,  unsigned char* talkerAlias, c
 {
     char text[40U];
 
+    if (m_screenLayout<2U) return;
+
     if (type[0]==' ') {
         if (slotNo == 1U) {
 	    sendCommand("t0.pco=33808");
@@ -421,17 +423,17 @@ void CNextion::clearDMRInt(unsigned int slotNo)
 {
 	if (slotNo == 1U) {
 		sendCommand("t0.txt=\"1 Listening\"");
-		sendCommand("t0.pco=0");
 		if (m_screenLayout==2U) {
+		    sendCommand("t0.pco=0");
 		    sendCommand("t0.font=4");
 		}
 		sendCommand("t1.txt=\"\"");
 		sendCommand("t4.txt=\"\"");
 		sendCommand("t6.txt=\"\"");
 	} else {
 		sendCommand("t2.txt=\"2 Listening\"");
-		sendCommand("t2.pco=0");
 		if (m_screenLayout==2U) {
+		    sendCommand("t2.pco=0");
 		    sendCommand("t2.font=4");
 		}
 		sendCommand("t3.txt=\"\"");

Nextion_ON7LDS/README

@@ -0,0 +1,29 @@
+The files in this directory are Nextion screen layouts with better fonts than
+ the(rather ugly) standard Nextion fonts
+
+There are some other changes:
+
+* On the main screen there is a field to display the active ip address of the
+  device. On Linux it is preceded with the network interface name.
+* DMR: if received, the Talker Alias is decoded and displayed. The TA will be
+  in green, so the user knows it is a decoded TA displaying.
+  This happens on-the-fly: as the parts of the TA arrive, they will immediately
+  be shown.
+* If you want to change my screen layout, the only thing to keep in mind is
+  that the MMDVMHost program will select following font numbers:
+        default font for the TA field : font 4
+        TA >16 characters             : font 3
+        TA >20 characters             : font 2
+        TA >24 characters             : font 1
+  There always have to be at least 5 fonts, of which font 1-4 are used for the
+  TA. If your display is wide enough to show all characters in one font, you
+  must copy this font to the lesser ('smaller') fonts.
+  i.e. : the 3.2" the display can show more than 31 characters (the maximum
+  TA length) in font 2, so this font is also copied to font 1.
+* The screenlayout has to be selected with the parameter ScreenLayout in the
+  MMDVM.ini file under the Nextion section. This way, the extra function
+  to automatically change the font size, is activated.
+    0 = auto (future use, for now it's G4KLX layout)
+    1 = G4KLX layout
+    2 = ON7LDS layout
+