add config variable to enable or disable SNDCP channel grant requests;

config.example.yml

@@ -69,6 +69,7 @@ protocols:
         noStatusAck: false
         noMessageAck: true
         unitToUnitAvailCheck: true
+        sndcpGrant: false
         silenceThreshold: 124
         disableNetworkHDU: false
         queueSize: 5000

p25/Control.cpp

@@ -232,6 +232,8 @@ void Control::setOptions(yaml::Node& conf, const std::string cwCallsign, const s
     m_trunk->m_noMessageAck = p25Protocol["noMessageAck"].as<bool>(true);
     m_trunk->m_unitToUnitAvailCheck = p25Protocol["unitToUnitAvailCheck"].as<bool>(true);
     
+    m_trunk->m_sndcpChGrant = p25Protocol["sndcpGrant"].as<bool>(false);
+
     yaml::Node control = p25Protocol["control"];
     m_control = control["enable"].as<bool>(false);
     if (m_control) {
@@ -310,6 +312,8 @@ void Control::setOptions(yaml::Node& conf, const std::string cwCallsign, const s
         LogInfo("    Verify Affiliation: %s", m_trunk->m_verifyAff ? "yes" : "no");
         LogInfo("    Verify Registration: %s", m_trunk->m_verifyReg ? "yes" : "no");
 
+        LogInfo("    SNDCP Channel Grant: %s", m_trunk->m_sndcpChGrant ? "yes" : "no");
+
         LogInfo("    No Status ACK: %s", m_trunk->m_noStatusAck ? "yes" : "no");
         LogInfo("    No Message ACK: %s", m_trunk->m_noMessageAck ? "yes" : "no");
         LogInfo("    Unit-to-Unit Availability Check: %s", m_trunk->m_unitToUnitAvailCheck ? "yes" : "no");

p25/TrunkPacket.cpp

@@ -309,7 +309,12 @@ bool TrunkPacket::process(uint8_t* data, uint32_t len, bool preDecoded)
                         m_rfTSBK.getDataServiceOptions(), m_rfTSBK.getDataAccessControl(), srcId);
                 }
 
-                writeRF_TSDU_SNDCP_Grant(false, false);
+                if (m_sndcpChGrant) {
+                    writeRF_TSDU_SNDCP_Grant(false, false);
+                }
+                else {
+                    writeRF_TSDU_Deny(P25_DENY_RSN_SYS_UNSUPPORTED_SVC, TSBK_ISP_SNDCP_CH_REQ);
+                }
                 break;
             case TSBK_IOSP_STS_UPDT:
                 // validate the source RID
@@ -1308,6 +1313,7 @@ TrunkPacket::TrunkPacket(Control* p25, network::BaseNetwork* network, bool dumpT
     m_adjSiteUpdateTimer(1000U),
     m_adjSiteUpdateInterval(ADJ_SITE_TIMER_TIMEOUT),
     m_ctrlTSDUMBF(true),
+    m_sndcpChGrant(false),
     m_dumpTSBK(dumpTSBKData),
     m_verbose(verbose),
     m_debug(debug)

p25/TrunkPacket.h

@@ -166,6 +166,8 @@ namespace p25
 
         bool m_ctrlTSDUMBF;
 
+        bool m_sndcpChGrant;
+
         bool m_dumpTSBK;
 
         bool m_verbose;