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openclaw/docs/reference/rpc.md

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+---
+summary: "RPC adapters for external CLIs (signal-cli, legacy imsg) and gateway patterns"
+read_when:
+  - Adding or changing external CLI integrations
+  - Debugging RPC adapters (signal-cli, imsg)
+title: "RPC Adapters"
+---
+
+# RPC adapters
+
+OpenClaw integrates external CLIs via JSON-RPC. Two patterns are used today.
+
+## Pattern A: HTTP daemon (signal-cli)
+
+- `signal-cli` runs as a daemon with JSON-RPC over HTTP.
+- Event stream is SSE (`/api/v1/events`).
+- Health probe: `/api/v1/check`.
+- OpenClaw owns lifecycle when `channels.signal.autoStart=true`.
+
+See [Signal](/channels/signal) for setup and endpoints.
+
+## Pattern B: stdio child process (legacy: imsg)
+
+> **Note:** For new iMessage setups, use [BlueBubbles](/channels/bluebubbles) instead.
+
+- OpenClaw spawns `imsg rpc` as a child process (legacy iMessage integration).
+- JSON-RPC is line-delimited over stdin/stdout (one JSON object per line).
+- No TCP port, no daemon required.
+
+Core methods used:
+
+- `watch.subscribe` → notifications (`method: "message"`)
+- `watch.unsubscribe`
+- `send`
+- `chats.list` (probe/diagnostics)
+
+See [iMessage](/channels/imessage) for legacy setup and addressing (`chat_id` preferred).
+
+## Adapter guidelines
+
+- Gateway owns the process (start/stop tied to provider lifecycle).
+- Keep RPC clients resilient: timeouts, restart on exit.
+- Prefer stable IDs (e.g., `chat_id`) over display strings.