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smp server: fix handshake compatibility by moving server info to SMP v21 #1845

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Merged
epoberezkin merged 1 commit into from
Aug 8, 2026
+7 −5
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smp server: fix handshake compatibility by moving server info to SMP v21 #1845

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3 changes: 2 additions & 1 deletion protocol/simplex-messaging.md
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
Version 20, 2026-05-25
Version 21, 2026-07-05

# Simplex Messaging Protocol (SMP)

Expand Down Expand Up @@ -107,6 +107,7 @@ This document describes SMP protocol version 20. Versions 1-5 are discontinued.
- v18: support client notices in BLOCKED error
- v19: service subscriptions to messages (SUBS, NSUBS, SOKS, ENDS, ALLS commands)
- v20: public namespaces resolver (RSLV command, RNAME response) — direct or forwarded via PFWD
- v21: server public information in handshake

## Introduction

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9 changes: 5 additions & 4 deletions src/Simplex/Messaging/Transport.hs
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Expand Up @@ -169,7 +169,8 @@ smpBlockSize = 16384
-- 17 - create notification credentials with NEW (7/12/2025)
-- 18 - support client notices (10/10/2025)
-- 19 - service subscriptions to messages (10/20/2025)
-- 20 - server public information in handshake (7/5/2026)
-- 20 - public namespaces resolver, RSLV command (6/20/2026)
-- 21 - server public information in handshake (7/5/2026)

data SMPVersion

Expand Down Expand Up @@ -204,7 +205,7 @@ namesSMPVersion :: VersionSMP
namesSMPVersion = VersionSMP 20

serverInfoSMPVersion :: VersionSMP
serverInfoSMPVersion = VersionSMP 20
serverInfoSMPVersion = VersionSMP 21

minClientSMPRelayVersion :: VersionSMP
minClientSMPRelayVersion = VersionSMP 14
Expand All @@ -213,10 +214,10 @@ minServerSMPRelayVersion :: VersionSMP
minServerSMPRelayVersion = VersionSMP 14

currentClientSMPRelayVersion :: VersionSMP
currentClientSMPRelayVersion = VersionSMP 20
currentClientSMPRelayVersion = VersionSMP 21

currentServerSMPRelayVersion :: VersionSMP
currentServerSMPRelayVersion = VersionSMP 20
currentServerSMPRelayVersion = VersionSMP 21

-- Max SMP protocol version to be used in e2e encrypted connection between
-- client and server, as defined by SMP proxy. Normally set below the current
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