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rcs-messaging

Telecom | rcs-messaging — carrier rich messaging that replaces SMS between Android and iPhone: IMS/SIP registration with AKA, MSRP chat sessions, HTTP file transfer, capability discovery, SMS fallback, MLS end-to-end encryption (GSMA Universal Profile 3.x), verified business senders (RBM)

Google Jibe (Google Messages), Apple Messages RCS (iOS 18+), Samsung Messages, Mavenir and Ericsson RCS cores, RCS Business Messaging

SystemTechniques · 18Primitives · 63 rcs-messaging Deterministic simulation testingdistributed · medium: Run the whole system in one thread under a seeded scheduler with simulated network, disk and clock, so every failure replays from its seed.›Durable job queuedistributed · medium: Persisted tasks that workers lease for a visibility timeout, ack on success and retry with backoff; at-least-once execution that survives worker and queue crashes.›Primary-backup replicationdistributed · medium: One node orders all writes and ships them to standbys; the acknowledgement rule (none, one, all) sets what a crash loses, and an external arbiter decides who takes over.›Least cost routingnetworking · medium: Pick carrier routes by prefix, price, quality and failoverMobile push deliverynetworking · medium: Sending notifications through APNs and FCM: HTTP/2 requests, token hygiene, collapse keys, TTL and priority, and the retry rules that keep you un-throttled.›AKA (authentication and key agreeme…security · medium: Symmetric-key challenge-response in which a chip and its home server prove knowledge of one key, with a sequence number for freshness, and derive session keys.›Coverage-guided fuzzingsecurity · medium: Mutate inputs, run an instrumented target, and keep any input that reaches a new code edge; feedback turns blind guessing into incremental search.›Idempotency keysfinance · low: Client-chosen unique key per logical operation, stored with a request fingerprint and the final response, so retries replay the first result instead of acting twice.›E164 number parsingdata-structures · low: Parse, validate and normalize phone numbers to E.164X509 certificatessecurity · low: Certificate chains, path validation, SANs, revocation and short-lived issuanceHdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesMessage sequence numbersdistributed · low: A per-stream counter on every message lets the receiver detect loss, duplicates and reordering, ack cheaply and resume after reconnect with "send from N".›Process supervisionhardware-os · low: A parent process starts services, reaps their exits and restarts them under a delay and burst-limit policy, then stops them with SIGTERM before SIGKILL.›Sip signalingmedia · low: SIP call setup, dialogs, SDP offer/answer and registrar/proxy routingMsrp sessionsnetworking · low: Message Session Relay Protocol: session-based chunked message and file relay negotiated via SDPRcs autoconfigurationnetworking · low: Rich Communication Services client provisioning: configuration fetch, validity and re-registrationResumable uploadsnetworking · low: Open an upload session, send the body in offset-addressed chunks, and after any failure ask the server how much it committed and continue from there.›Sms encoding segmentationnetworking · low: GSM-7/UCS-2 encoding and concatenated SMS segmentation with UDHMutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Graceful drainingsystems · low: On a termination signal, stop taking new work, finish in-flight work until a deadline, tell clients to reconnect elsewhere, then exit; clients resume from a token.›Cooperative schedulingconcurrency · low: Green threads/coroutines yielding at await points on a user-space schedulerRecord replaydistributed · low: Record every nondeterministic input (time, randomness, I/O, model and tool outputs, per-tick player input) and re-execute deterministically for debugging, replays and state rebuildPRNGs (PCG, xoshiro)numerics · low: Small, fast, statistically strong non-cryptographic generators: PCG32 and xoshiro256**, with seeding, parallel streams and unbiased ranges.›+ 11 more techniques+ 47 more primitives

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