smppgateway.io

What It Is

SMPP Gateway is a modern open-source implementation of SMPP 3.4 built for Java 21, positioned as a replacement in the Java ecosystem for the now-unmaintained Cloudhopper. It consists of two components: smpp-core and smpp-kafka-producer. The former provides PDU handling, encoding/decoding, and SMPP server and client capabilities; the latter is designed for event-driven SMS processing and provides SMPP-to-Kafka bridging.

Core Capabilities

From a technical-stack perspective, the project emphasizes Java 21 LTS, using virtual threads, records, sealed classes, and pattern matching. It also models PDUs as immutable objects to improve thread safety in concurrent scenarios. The transport layer is based on Netty and mentions zero-copy buffers, with the goal of delivering high throughput and low latency. In terms of API design, it offers fluent builders, CompletableFuture-based asynchronous operations, and straightforward session management. The crawled text includes short code examples for SmppServer and SmppClient, making the onboarding path relatively clear.

Integration, Deployment, and Documentation

For observability, SMPP Gateway supports optional Micrometer integration and is geared toward Prometheus metrics and Grafana dashboards. Production-oriented features include automatic reconnection, request windowing, TLS, and error handling. smpp-kafka-producer also includes an HTTP/2 REST API, Docker and Kubernetes support, making it suitable for cloud-native SMS platforms. Documentation entry points, benchmarks, comparison pages, GitHub, and Maven Central are all presented, but the main text does not provide full documentation depth or real benchmark data.

Pricing and Open Source

The project is clearly open source under the Apache 2.0 license, and smpp-core is available from Maven Central. The text does not mention a commercial edition, hosted service, or paid support, so it can be treated as free and open source, though enterprise-grade SLA availability is unclear.

Pros, Cons, and Who It’s For

Its strengths include a modern Java stack, relatively complete SMPP client/server capabilities, a thread-safe design, and strong integration with Kafka and monitoring ecosystems. The drawbacks are its strong dependency on Java 21, which may create migration barriers for older Java systems; support channels appear to be mainly email and GitHub Issues, with no visible commercial support commitment. It is well suited to telecom, SMS verification code, notification platform, gateway, and event-stream processing teams.

Access from China

The crawled text does not provide information about access from mainland China, mirrors, payments, or compliance, so its accessibility status is unknown. Domestic teams in China should pay attention to the availability of Maven Central and GitHub, and may use Cloudhopper as a historical comparison point.