feat: add driver/uri/deviceArgs backend config plumbing

.gitignore

@@ -7,3 +7,5 @@ build/
 *.iq
 *.raw
 *.bak
+*.zip
+*.exe

cmd/fmrtx/main.go

@@ -153,9 +153,17 @@ func runTXMode(cfg cfgpkg.Config, driver platform.SoapyDriver, autoStart bool, a
 	// OutputDrive controls composite signal level, NOT hardware gain.
 	// Hardware TX gain is always 0 dB (max power). Use external attenuator for power control.
 	soapyCfg := platform.SoapyConfig{
-		Driver:       cfg.Backend.Device,
+		Driver:       cfg.Backend.Driver,
+		Device:       cfg.Backend.Device,
 		CenterFreqHz: cfg.FM.FrequencyMHz * 1e6,
 		GainDB:       0, // 0 dB = max TX power on PlutoSDR
+		DeviceArgs:   map[string]string{},
+	}
+	if cfg.Backend.URI != "" {
+		soapyCfg.DeviceArgs["uri"] = cfg.Backend.URI
+	}
+	for k, v := range cfg.Backend.DeviceArgs {
+		soapyCfg.DeviceArgs[k] = v
 	}
 	soapyCfg.SampleRateHz = cfg.EffectiveDeviceRate()
 

docs/config.plutosdr.json

@@ -32,6 +32,9 @@
   "backend": {
     "kind": "pluto",
     "device": "usb:",
+    "driver": "",
+    "uri": "",
+    "deviceArgs": {},
     "outputPath": "",
     "deviceSampleRateHz": 2280000
   },

internal/config/config.go

@@ -50,10 +50,13 @@ type FMConfig struct {
 }
 
 type BackendConfig struct {
-	Kind               string  `json:"kind"`
-	Device             string  `json:"device"`
-	OutputPath         string  `json:"outputPath"`
-	DeviceSampleRateHz float64 `json:"deviceSampleRateHz"` // actual SDR device rate; 0 = same as compositeRateHz
+	Kind               string            `json:"kind"`
+	Driver             string            `json:"driver,omitempty"`
+	Device             string            `json:"device"`
+	URI                string            `json:"uri,omitempty"`
+	DeviceArgs         map[string]string `json:"deviceArgs,omitempty"`
+	OutputPath         string            `json:"outputPath"`
+	DeviceSampleRateHz float64           `json:"deviceSampleRateHz"` // actual SDR device rate; 0 = same as compositeRateHz
 }
 
 type ControlConfig struct {