Valheim Update: Mod crashes due to newly introduced network requirements

[Mydayyy]

The latest Valheim update fixed a new things, one of which is switching to another method of sending data via steam.

Prior to the update:

private void SendQueuedPackages()
{
if (!this.IsConnected())
return;
while (this.m_sendQueue.Count > 0)
{
byte[] numArray = this.m_sendQueue.Peek();
EP2PSend ep2Psend = (EP2PSend) 2;
if (!SteamNetworking.SendP2PPacket(this.m_peerID, numArray, (uint) numArray.Length, ep2Psend, 0))
break;
this.m_totalSent += numArray.Length;
this.m_sendQueue.Dequeue();
}
}

After the update:

private void SendQueuedPackages()
{
if (!this.IsConnected())
return;
while (this.m_sendQueue.Count > 0)
{
byte[] source = this.m_sendQueue.Peek();
IntPtr num1 = Marshal.AllocHGlobal(source.Length);
Marshal.Copy(source, 0, num1, source.Length);
long num2;
EResult connection = SteamNetworkingSockets.SendMessageToConnection(this.m_con, num1, (uint) source.Length, 9, ref num2);
Marshal.FreeHGlobal(num1);
if (connection == 1)
{
this.m_totalSent += source.Length;
this.m_sendQueue.Dequeue();
}
else
{
ZLog.Log((object) ("Failed to send data " + (object) connection));
break;
}
}
}

The main change is switching from SendP2PPacket to SendMessageToConnection. SendMessageToConnection has a limit on package size which we slighty exceed:

Reliable message send. Can send up to k_cbMaxSteamNetworkingSocketsMessageSizeSend bytes in a single message. Does fragmentation/re-assembly of messages under the hood, as well as a sliding window for efficient sends of large chunks of data.

Where k_cbMaxSteamNetworkingSocketsMessageSizeSend is defined as: const int k_cbMaxSteamNetworkingSocketsMessageSizeSend = 512 * 1024;

The fix for this is to implement chunking for sending the map data