Add unreliable (UDP) event support#493
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Add MP.TriggerClientEventUnreliable and MP.TriggerClientEventJsonUnreliable
Lua bindings, mirror of the reliable versions using UDP transport ('e' packets
instead of 'E'). InternalTriggerClientEvent now takes a Rel flag to select
between TCP and UDP delivery.
'E' and 'e' packets both route through the same HandleEvent handler.
Client events reach Lua handlers identically regardless of transport
reliability.
Use case: high-frequency loss-tolerant data where TCP retransmission of
stale data is actively harmful.
This was referenced Jun 14, 2026
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Adds an unreliable counterpart to the existing reliable event system, allowing mods to send events over UDP instead of TCP.
New API
Server-side Lua:
MP.TriggerClientEventUnreliable(PlayerID, EventName, Data)— UDP deliveryMP.TriggerClientEventJsonUnreliable(PlayerID, EventName, Data)— JSON variantClient-side Lua:
TriggerServerEventUnreliable(EventName, Data)— sendse:EventName:Datato serverHow it works
Reliable events use
E(uppercase) as the packet prefix, unreliable usee(lowercase). Both follow the same code path — the only difference is TCP vs UDP transport.The launcher skips the >1KB compressed-size TCP upgrade for
epackets so they stay on UDP regardless of payload size.Why
The existing event system only supports reliable delivery. This forces TCP retransmission for every event, which is unnecessary overhead for data that doesn't need guaranteed delivery. This adds the option to opt into UDP where appropriate.
See also: BeamMP/BeamMP-Launcher#253, BeamMP/BeamMP#892