# RF-Bridge-OB38S003 > RF-Bridge-OB38S003 provides replacement firmware for 433 MHz radio-to-Wi-Fi bridges that decodes radio packets and sniffs unknown codes. It offers passthrough, RCSwitch and Portisch modes for Sonoff Bridge R2 boards and supported 8051 microcontrollers, forwarding results over UART to the ESP8265. - Type: Tool - Targets: Protocol - Category: Protocol analysis tools - Relationship: Foundation tool - Sources reviewed: 2026-11-08 - Added to the catalog: 2026-11-09 - Original resource: - Primary source: - Catalog page: - Record JSON: - Chinese version: [简体中文](https://awesomerea.org/zh/resources/rf-bridge-ob38s003/index.md) ## Requirements & limits - **Prerequisites:** Requires a supported bridge board or microcontroller and multiple flashing steps. - **Prerequisites:** Building requires SDCC 4.5.0 or later. - **Limits:** Portisch may output garbage after many hours in sniffing mode. - **License:** BSD-2-Clause licence. ## Primary sources 1. ## More in Protocols - [RFLink ESP](https://awesomerea.org/resources/rflink-esp/index.md) · Tool - [bedrock-protocol](https://awesomerea.org/resources/bedrock-protocol/index.md) · Tool - [Twonkie](https://awesomerea.org/resources/twonkie-usb-pd-sniffer/index.md) · Tool - [BresserWeatherSensorReceiver](https://awesomerea.org/resources/bresser-weather-sensor-receiver/index.md) · Tool - [rtlamr](https://awesomerea.org/resources/rtlamr/index.md) · Tool - [ORBCOMM receiver](https://awesomerea.org/resources/orbcomm-receiver/index.md) · Tool ## About this entry The description was reviewed against primary sources. Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.