Add UART SET_LOG_LEVEL for runtime master ESP-IDF logging.

Expose the command via goTool CLI/REST and dashboard controls so log verbosity can be tuned without reflashing.

Co-authored-by: Cursor <cursoragent@cursor.com>

goTool/api_serve.go

@@ -74,6 +74,17 @@ type restartAPIResponse struct {
 	Error    string `json:"error,omitempty"`
 }
 
+type logLevelAPIResponse struct {
+	Success bool   `json:"success"`
+	Level   uint32 `json:"level"`
+	Error   string `json:"error,omitempty"`
+}
+
+type logLevelAPIRequest struct {
+	Write bool   `json:"write"`
+	Level uint32 `json:"level"`
+}
+
 type otaAPIResponse struct {
 	Success       bool   `json:"success"`
 	BytesWritten  uint32 `json:"bytes_written,omitempty"`
@@ -125,6 +136,16 @@ func mountServeAPI(mux *http.ServeMux, link *managedSerial, hub *wsHub, streamCt
 		}
 		serveRestart(w, r, link)
 	})
+	mux.HandleFunc("/api/log-level", func(w http.ResponseWriter, r *http.Request) {
+		switch r.Method {
+		case http.MethodGet:
+			serveLogLevelGet(w, r, link)
+		case http.MethodPost:
+			serveLogLevelPost(w, r, link)
+		default:
+			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+		}
+	})
 	mux.HandleFunc("/api/ota", func(w http.ResponseWriter, r *http.Request) {
 		if r.Method != http.MethodPost {
 			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
@@ -280,6 +301,43 @@ func applyDeadzoneToSlaves(link *managedSerial, deadzone uint32) (uint32, error)
 	return updated, nil
 }
 
+func serveLogLevelGet(w http.ResponseWriter, r *http.Request, link *managedSerial) {
+	resp, err := link.SetLogLevel(false, 0)
+	if err != nil {
+		writeJSON(w, http.StatusServiceUnavailable, logLevelAPIResponse{Error: err.Error()})
+		return
+	}
+	writeJSON(w, http.StatusOK, logLevelAPIResponse{
+		Success: resp.GetSuccess(),
+		Level:   resp.GetLevel(),
+	})
+}
+
+func serveLogLevelPost(w http.ResponseWriter, r *http.Request, link *managedSerial) {
+	var body logLevelAPIRequest
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+		writeJSON(w, http.StatusBadRequest, logLevelAPIResponse{Error: "invalid JSON"})
+		return
+	}
+	if !body.Write {
+		writeJSON(w, http.StatusBadRequest, logLevelAPIResponse{Error: "write must be true"})
+		return
+	}
+	if body.Level > 5 {
+		writeJSON(w, http.StatusBadRequest, logLevelAPIResponse{Error: "level must be 0–5"})
+		return
+	}
+	resp, err := link.SetLogLevel(true, body.Level)
+	if err != nil {
+		writeJSON(w, http.StatusServiceUnavailable, logLevelAPIResponse{Error: err.Error()})
+		return
+	}
+	writeJSON(w, http.StatusOK, logLevelAPIResponse{
+		Success: resp.GetSuccess(),
+		Level:   resp.GetLevel(),
+	})
+}
+
 func serveRestart(w http.ResponseWriter, r *http.Request, link *managedSerial) {
 	var body restartAPIRequest
 	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {