Squashed commit of the following:

commit 4d8efcdd05
Author: Asbelos <asbelos@btinternet.com>
Date:   Wed Mar 1 16:32:05 2023 +0000

    Reinstate obsolete <s>

commit 003313998b
Author: Asbelos <asbelos@btinternet.com>
Date:   Wed Mar 1 16:07:11 2023 +0000

    Change <I><G> to <JI><JG>

commit c72bf51959
Author: Asbelos <asbelos@btinternet.com>
Date:   Sat Feb 25 17:38:39 2023 +0000

    G and I commands

DCCEXParser.cpp

@@ -79,6 +79,8 @@ const int16_t HASH_KEYWORD_TT=2688;
 const int16_t HASH_KEYWORD_VPIN=-415;
 const int16_t HASH_KEYWORD_A='A';
 const int16_t HASH_KEYWORD_C='C';
+const int16_t HASH_KEYWORD_G='G';
+const int16_t HASH_KEYWORD_I='I';
 const int16_t HASH_KEYWORD_R='R';
 const int16_t HASH_KEYWORD_T='T';
 const int16_t HASH_KEYWORD_X='X';
@@ -501,8 +503,10 @@ void DCCEXParser::parseOne(Print *stream, byte *com, RingStream * ringStream)
         return;
 
     case 'c': // SEND METER RESPONSES <c>
-        // No longer supported because of multiple tracks                               <c MeterName value C/V unit min max res warn>
-        break;
+        // No longer useful because of multiple tracks See <JG> and <JI>
+        if (params>0) break;
+        TrackManager::reportObsoleteCurrent(stream);
+        return;
 
     case 'Q': // SENSORS <Q>
         Sensor::printAll(stream);
@@ -583,6 +587,16 @@ void DCCEXParser::parseOne(Print *stream, byte *com, RingStream * ringStream)
                     }
                     CommandDistributor::setClockTime(p[1], p[2], 1);
                     return;
+                
+                case HASH_KEYWORD_G: // <JG> current gauge limits
+                    if (params>1) break;
+                    TrackManager::reportGauges(stream);   // <g limit...limit>     
+                    return;
+                
+                case HASH_KEYWORD_I: // <JI> current values
+                    if (params>1) break;
+                    TrackManager::reportCurrent(stream);   // <g limit...limit>     
+                    return;
 
                 case HASH_KEYWORD_A: // <JA> returns automations/routes
                     StringFormatter::send(stream, F("<jA"));

Release_Notes/CommandRef.md

@@ -0,0 +1,171 @@
+This file is being used to consolidate the command reference information. 
+
+General points:
+  - Commands below have a single character opcode and parameters.
+  Even <JA> is actually read as <J A> 
+  - Keyword parameters are shown in upper case but may be entered in mixed case.
+  - value parameters are numeric.
+  - [something]  indicates its optional.
+  - Not all commands have a response, and not all responses come from the last commands that you have issued.
+   
+Startup status
+<s>
+
+Track power management
+<1>
+<1 MAIN|PROG|JOIN>
+<0>
+<0 MAIN|PROG>
+
+Basic manual control
+<t cab speed direction> 
+<F cab function 1|0>
+<!>
+<T id 0|1|T|C>
+
+DCC accessory control
+<a address subaddress activate [onoff]>
+<a linearaddress activate> 
+
+
+Turnout definition
+Note: Turnouts are best defined in myAutomation.h where a turnout description can also be provided ( refer to EXRAIL documentation) or by using these commands in a mySetup.h file. 
+
+<T id SERVO vpin thrown closed profile>
+<T id VPIN vpin>
+<T id DCC addr subaddr>
+<T id DCC linearaddr>
+
+
+Outputs
+<Z id activate>
+<Z id vpin iflag>
+
+Sensors 
+<S id vpin pullup>
+
+Decoder programming
+<w cab cv value>
+<b cab cv bit value>
+<W cabid>
+<W cv value>
+<V cv value>
+<V cv bit value>
+<R>
+<R cv>
+<B cv bit value>
+<D ACK ON|OFF>
+<D ACK LIMIT|MIN|MAX|RETRY value>
+<D PROGBOOST>
+
+Advanced DCC control
+<M  packet.... >
+<P  packet ...>
+<f map1 map2 [map3]>
+<#>
+<->
+<- cabid>
+<D CABS>
+<D SPEED28>
+<D SPEED128>
+
+
+EEPROM commands
+These commands exist for
+backwards JMRI compatibility. 
+You are strongly discouraged from maintaining your configuration settings in EEPROM.    
+<E>
+<e>
+<D EEPROM>
+<T>
+<T id>
+<S>
+<S id>
+<Z>
+<Z id>
+
+Diagnostic commands
+<D CMD ON|OFF>
+<D WIFI ON|OFF>
+<D ETHERNET ON|OFF>
+<D WIT ON|OFF>
+<D LCN ON|OFF>
+<D EXRAIL ON|OFF>
+<D RESET>
+<D SERVO|ANOUT vpin position [profile]>
+<D ANIN vpin>
+<D HAL SHOW>
+<D HAL RESET>
+<+ cmd>
+<+>
+<Q>
+
+User defined filter commands
+<U ....>
+<u ....>
+
+Track Management
+<=>
+<= track DCC|PROG|OFF>
+<= track DC|DCX cabid>
+<JG>
+<JI>
+
+
+Turntable interface
+<D TT vpin steps [activity]>
+
+Fast clock interface
+<JC>
+<JC mins rate>
+
+
+Advanced Throttle access to features
+<t cab>
+<JA>
+<JA id>
+<JR>
+<JR id>
+<JT>
+<JT id>
+
+*******************
+EXRAIL Commands
+*******************
+
+</>
+</PAUSE>
+</RESUME>
+</START cab sequence>
+</START sequence>
+</KILL taskid>
+</KILL ALL>
+</RESERVE|FREE blockid>
+</LATCH|UNLATCH latchid>
+</RED|AMBER|GREEN signalid>
+
+Obsolete commands/formats
+<c>
+<t ignored cab speed direction> 
+<T id vpin thrown closed>
+<T id addr subaddr>
+<B cv bit value obsolete obsolete>
+<R cv obsolete obsolete>
+<W cv value obsolete obsolete>
+
+Broadcast responses
+Note: broadcasts are sent to all throttles when appropriate (usually because something has changed)
+
+<p0>
+<p1>
+<p1 MAIN|PROG|JOIN>
+
+<l cab slot dccspeed functionmap>
+<H id 1|0>
+<jC mmmm speed>
+
+Diagnostic responses
+These are not meant to be software readable. They contain diagnostic information for programmers to identify issues.
+<X> 
+<*  ... *>
+

TrackManager.cpp

@@ -423,7 +423,35 @@ POWERMODE TrackManager::getProgPower() {
                 return track[t]->getPower();
     return POWERMODE::OFF;   
   }
-   
+
+void TrackManager::reportObsoleteCurrent(Print* stream) {
+  // This function is for backward JMRI compatibility only
+  // It reports the first track only, as main, regardless of track settings.
+  //  <c MeterName value C/V unit min max res warn>
+  int maxCurrent=track[0]->raw2mA(track[0]->getRawCurrentTripValue());
+  StringFormatter::send(stream, F("<c CurrentMAIN %d C Milli 0 %d 1 %d>\n"), 
+            track[0]->raw2mA(track[0]->getCurrentRaw(false)), maxCurrent, maxCurrent);                  
+}
+
+void TrackManager::reportCurrent(Print* stream) {
+    StringFormatter::send(stream,F("<jI"));
+    FOR_EACH_TRACK(t) {
+         StringFormatter::send(stream, F(" %d"),
+         (track[t]->getPower()==POWERMODE::OVERLOAD) ? -1 :
+            track[t]->raw2mA(track[t]->getCurrentRaw(false)));
+         }
+    StringFormatter::send(stream,F(">\n"));    
+}
+
+void TrackManager::reportGauges(Print* stream) {
+    StringFormatter::send(stream,F("<jG"));
+    FOR_EACH_TRACK(t) {
+         StringFormatter::send(stream, F(" %d"),
+            track[t]->raw2mA(track[t]->getRawCurrentTripValue()));
+         }
+    StringFormatter::send(stream,F(">\n"));    
+}
+
 void TrackManager::setJoinRelayPin(byte joinRelayPin) {
   joinRelay=joinRelayPin;
   if (joinRelay!=UNUSED_PIN) {

TrackManager.h

@@ -77,6 +77,9 @@ class TrackManager {
     static bool isJoined() { return progTrackSyncMain;}
     static void setJoinRelayPin(byte joinRelayPin);
     static void sampleCurrent();
+    static void reportGauges(Print* stream);
+    static void reportCurrent(Print* stream);
+    static void reportObsoleteCurrent(Print* stream); 
     static int16_t joinRelay;
     static bool progTrackSyncMain;  // true when prog track is a siding switched to main
      static bool progTrackBoosted;   // true when prog track is not current limited