 iOS 18 crashes related to Bluetooth LE are now resolved. (#15351)

Disk usage stats are now reported in small peer info on android devices

 to the lambda if the document is not found (#14471)

WriteTransactionPendingIDSpecificOperation::update_v2()

 to the lambda if the document is not found. (#14471)

 compiler option, to generate position-independent code (#14911)

 function will now return a correct result if called before the 

, whose behavior did not match the documentation. Replaced with 

WriteTransactionPendingIDSpecificOperation::update()

An incorrect error log about loading the ditto core library on Android. (#14908)

This release comes with a number of logging clarity improvements. The goal of these changes are to make Ditto logs more consumable and actionable for end users. While there are wide ranging changes one of the principal goals of this work is to make our INFO level logs contain the right information to understand the state and health of the Ditto SDK.

 peer_metadata and identity_service_metadata to the small peer info document (#12477)

 headers as part of the client connect handshake on all platforms except 

Small Peer Info now includes information about the current logger configuration (#14317)

Permission rules can be written in DQL. (#14563)

Ditto logs clearly indicate if a device has established a connection to itself. (#14634)

the ability for DQL select statement to produce arbitrary projection lists. (#7979)

 local subscription info to small peer info (#9412)

 "device_disk_usage" information to small peer info (#9784)

 "store" information to small peer info (#9785)

 Internal sync metadata format changed. Peers that downgrade to a previous SDK version after upgrading may require full resynchronization. (#14799)

 Improved (de)serialization performance and reduced its contribution to the library size (#11545)

 In updated replication protocol, verification of a received update file no longer requires both peers to use the same approach to subscription hashing. (#12672)

Experimental multihop connectivity is more resilient to mesh disruptions (#13648)

Synchronization protocol enhanced to reduce the amount of redundant data sent from small peers to big peers. (#13737)

Failed certificate verification due to a lagging device clock now results in a clearer error message (#14035)

Multicast peer-to-peer transport is no longer deprecated to improve support for environments where mDNS is unavailable (#14188)

Replication no longer redundantly re-transmits unchanged subscriptions after eviction. (#14290)

truncated peer keys are now logged in lieu of site IDs. (#14362)

improved logging in the authentication code to provide more useful error context. (#15038)

made the small peer "log request" feature much more responsive (#9777)

Windows P2P LAN now can connect to IPv6 peers (#11468)

In certain rare cases, resetting the same replication session multiple times could cause failure to converge. (#12616)

Internal connection TLS caches are now bounded in size. This prevents a long living peer from holding onto more memory than required. (#13801)

small peer info "metadata" is now persisted across app launches. (#13987)

Bluetooth peers are handled better when disconnections occur, fixing a possible loop where a device might repeatedly try and fail to connect. (#14018)

When replication sessions time out, write transactions on the document store may be blocked for a long period. (#14148)

Multicast peer-to-peer transport (non-MDNS) is no longer influenced by TCP listen configuration in DittoTransportConfig (#14187)

an issue preventing attachment transfers under high document sync load is now resolved. (#14189)

 A race condition that could cause attachments to unexpectedly crash under heavy load. (#14342)

 device name no longer incorrectly defaults to "ditto" in small peer info, when a named device first starts syncing (#14674)

 presence observers are now less-likely to fire when there is no observable change to presence data. (#14807)

Logs report blocked_by="no blocking transaction" when blocking transaction is known (#14966)

In-band authentication data is now cleared on logout. (#15039)

switching appIDs now invalidates cached authentication material correctly. (#15040)

Transport conditions are now reported for a wider range of failures when starting Bluetooth and mDNS transports. (#8729)

 method to clarify that the Ditto store can be used locally after stopping sync. (#8849)

 Auth Client would hang when cached X.509 was expired. (#15110)

linux_aarm_supported_version

android_supported_version

ipados_supported_version

ios_supported_version

windows_x64_supported_version

mac_supported_version

linux_x64_supported_version

Rust

Where you get expert information for building cloud‑optional apps using Ditto.

C++

4.9.1 Version Release

4.9.0 Version Release

4.9.0 C++ Specific Changes