support decoding rogue OSP_SNDCP_CH_GNT (even tho on DVM you can *enable* this you shouldn't because there's no SNDCP application that will respond);

src/common/p25/lc/tsbk/OSP_SNDCP_CH_GNT.cpp

@@ -44,7 +44,19 @@ bool OSP_SNDCP_CH_GNT::decode(const uint8_t* data, bool rawTSBK)
 {
     assert(data != nullptr);
 
-    /* stub */
+    uint8_t tsbk[P25_TSBK_LENGTH_BYTES + 1U];
+    ::memset(tsbk, 0x00U, P25_TSBK_LENGTH_BYTES);
+
+    bool ret = TSBK::decode(data, tsbk, rawTSBK);
+    if (!ret)
+        return false;
+
+    ulong64_t tsbkValue = TSBK::toValue(tsbk);
+
+    m_dataServiceOptions = (uint8_t)((tsbkValue >> 56) & 0xFFU);                    // Data Service Options
+    m_grpVchId = (uint8_t)((tsbkValue >> 52) & 0x0FU);                              // Channel (T) ID
+    m_dataChannelNo = ((tsbkValue >> 40) & 0xFFFU);                                 // Channel (T) Number
+    m_dstId = (uint32_t)(tsbkValue & 0xFFFFFFU);                                    // Target Radio Address
 
     return true;
 }

src/common/p25/lc/tsbk/TSBKFactory.cpp

@@ -224,6 +224,8 @@ std::unique_ptr<TSBK> TSBKFactory::createTSBK(const uint8_t* data, bool rawTSBK)
         return decode(new ISP_AUTH_SU_DMD(), data, rawTSBK);
     case TSBKO::OSP_ADJ_STS_BCAST:
         return decode(new OSP_ADJ_STS_BCAST(), data, rawTSBK);
+    case TSBKO::OSP_SNDCP_CH_GNT:
+        return decode(new OSP_SNDCP_CH_GNT(), data, rawTSBK);
     default:
         LogError(LOG_P25, "TSBKFactory::create(), unknown TSBK LCO value, mfId = $%02X, lco = $%02X", mfId, lco);
         break;