"Invalid payload" error while connecting to Spigot server about fabric-mumblelink-mod

[magneticflux-]

This was interesting to debug! This is the Git Blame for the cause of the issue: Spigot Messenger.java.

Here's my vague history of custom packets:

• Jan. 2012: Dinnerbone creates the API blog post
  • This is around the 1.1/1.2 update?
  • The max length is 16 chars.
• Sometime before Aug. 2017: The length is increased
  • Sometime before the 1.11 update
  • New length is 20 chars.
• During the 1.11 update: The length is increased
  • New length is 32 chars?
• During the 1.13 update: The length cap is removed
  • According to this protocol wiki change (link) by Pokechu22, a Mojira mod
  • Technically limited to 32767 chars by PacketByteBuffer#writeString(String)

Given this information, and the commit by md_5 updating Spigot to 1.13-pre7 here only changing the limit from 20 to 32, it seems like a bug in Spigot. During the 1.13 update of Spigot, they should have removed the hard limit.

I'll open an issue on their JIRA link these two.

[magneticflux-]

@BobTagnil I opened an issue on Spigot's JIRA here. Please vote there to encourage it to be resolved faster.

[BobTagnil]

Great !
As a temporary fix I compiled the mod on my computer in order to fix it.

Thank you again for the support of this mumble feature

[Kuratius]

Can you make it configurable whether the client sends a custom packet? There are still a lot of spigot servers that reject it.