better handle same TGID RF preemption during grants when network call grants are disabled;

src/p25/Control.cpp

@@ -828,10 +828,12 @@ void Control::clock(uint32_t ms)
     if (m_netState == RS_NET_AUDIO || m_netState == RS_NET_DATA) {
         m_networkWatchdog.clock(ms);
 
-        if (m_networkWatchdog.hasExpired()) {
+        if (m_networkWatchdog.isRunning() && m_networkWatchdog.hasExpired()) {
             if (m_netState == RS_NET_AUDIO) {
-                ::ActivityLog("P25", false, "network watchdog has expired, %.1f seconds, %u%% packet loss",
-                    float(m_voice->m_netFrames) / 50.0F, (m_voice->m_netLost * 100U) / m_voice->m_netFrames);
+                if (m_voice->m_netFrames > 0.0F) {
+                    ::ActivityLog("P25", false, "network watchdog has expired, %.1f seconds, %u%% packet loss",
+                        float(m_voice->m_netFrames) / 50.0F, (m_voice->m_netLost * 100U) / m_voice->m_netFrames);
+                }
             }
             else {
                 ::ActivityLog("P25", false, "network watchdog has expired");

src/p25/packet/Trunk.cpp

@@ -2132,6 +2132,25 @@ bool Trunk::writeRF_TSDU_Grant(uint32_t srcId, uint32_t dstId, uint8_t serviceOp
         return true; // do not generate grant packets for $FFFF (All Call) TGID
     }
 
+    // are network channel grants disabled?
+    if (m_p25->m_disableNetworkGrant) {
+        // don't process RF grant if the network isn't in a idle state and the RF destination is the network destination
+        if (m_p25->m_netState != RS_NET_IDLE && dstId == m_p25->m_netLastDstId) {
+            LogWarning(LOG_RF, "Traffic collision detect, preempting new RF traffic to existing network traffic!");
+            LogWarning(LOG_RF, P25_TSDU_STR ", TSBK_IOSP_GRP_VCH (Group Voice Channel Request) denied, traffic collision, dstId = %u", dstId);
+            writeRF_TSDU_Deny(srcId, dstId, P25_DENY_RSN_PTT_COLLIDE, (grp) ? TSBK_IOSP_GRP_VCH : TSBK_IOSP_UU_VCH);
+
+            ::ActivityLog("P25", true, "group grant request from %u to TG %u denied", srcId, dstId);
+            m_p25->m_rfState = RS_RF_REJECTED;
+            return false;
+        }
+
+        // ensure network watchdog is stopped
+        if (m_p25->m_networkWatchdog.isRunning()) {
+            m_p25->m_networkWatchdog.stop();
+        }
+    }
+
     // are we skipping checking?
     if (!skip) {
         if (m_p25->m_rfState != RS_RF_LISTENING && m_p25->m_rfState != RS_RF_DATA) {

src/p25/packet/Voice.cpp

@@ -96,6 +96,7 @@ void Voice::resetNet()
     m_netLost = 0U;
     m_vocLDU1Count = 0U;
     m_roamLDU1Count = 0U;
+    m_p25->m_networkWatchdog.stop();
 }
 
 /// <summary>