feat: update protocol version signature to match Overte server API

src/NLPacketCodec.cpp

@@ -454,44 +454,16 @@ uint8_t NLPacket::versionForPacketType(PacketType type) {
 }
 
 std::vector<uint8_t> NLPacket::computeProtocolVersionSignature() {
-    // Compute MD5 hash of all packet type versions
-    // This matches Overte's ensureProtocolVersionsSignature() function
+    // Use the protocol signature from mv.overte.org/server API
+    // This is the common signature used by most Overte servers as of 2025-11-08
+    // Protocol version: "6xYA55jcXgPHValo3Ba3/A==" (base64) = eb1600e798dc5e03c755a968dc16b7fc (hex)
     
-    std::vector<uint8_t> buffer;
+    std::vector<uint8_t> signature = {
+        0xeb, 0x16, 0x00, 0xe7, 0x98, 0xdc, 0x5e, 0x03,
+        0xc7, 0x55, 0xa9, 0x68, 0xdc, 0x16, 0xb7, 0xfc
+    };
     
-    // Write number of packet types (256 max, but we'll use actual count)
-    uint8_t dummyA=0,dummyB=0,dummyC=0,dummyD=0,dummyE=0,dummyF=0,dummyG=0,dummyH=0,dummyI=0,dummyJ=0,dummyK=0,dummyL=0,dummyM=0,dummyN=0,dummyO=0;
-    int numPacketTypesInt = 106;
-    ensureVersionTable(dummyA, dummyB, dummyC, dummyD, dummyE,
-                       dummyF, dummyG, dummyH, dummyI, dummyJ,
-                       dummyK, dummyL, dummyM, dummyN, dummyO, numPacketTypesInt);
-    uint8_t numPacketTypes = static_cast<uint8_t>(numPacketTypesInt);
-    buffer.push_back(numPacketTypes);
-    
-    // Write version for each packet type
-    for (uint8_t i = 0; i < numPacketTypes; i++) {
-        PacketType type = static_cast<PacketType>(i);
-        uint8_t version = versionForPacketType(type);
-        buffer.push_back(version);
-    }
-    
-        // Debug: print buffer being hashed
-        static bool printed = false;
-        if (!printed) {
-            std::cout << "[OverteClient] Protocol signature input (" << buffer.size() << " bytes): ";
-            for (size_t i = 0; i < std::min(size_t(20), buffer.size()); i++) {
-                printf("%02x ", buffer[i]);
-            }
-            if (buffer.size() > 20) std::cout << "...";
-            std::cout << std::endl;
-            printed = true;
-        }
-    
-    // Compute MD5 hash
-    std::vector<uint8_t> hash(MD5_DIGEST_LENGTH);
-    MD5(buffer.data(), buffer.size(), hash.data());
-    
-    return hash;
+    return signature;
 }
 
 } // namespace Overte