Resolve monitors from platform.txt

Author: cmaglie

Diff for: arduino/cores/cores.go

@@ -62,6 +62,7 @@ type PlatformRelease struct {
 	IsIDEBundled            bool                   `json:"-"`
 	IsTrusted               bool                   `json:"-"`
 	PluggableDiscoveryAware bool                   `json:"-"` // true if the Platform supports pluggable discovery (no compatibility layer required)
+	Monitors                map[string]*MonitorDependency
 }
 
 // BoardManifest contains information about a board. These metadata are usually

Diff for: arduino/cores/packagemanager/loader.go

@@ -326,6 +326,7 @@ func (pm *PackageManager) loadPlatformRelease(platform *cores.PlatformRelease, p
 	} else {
 		platform.Properties.Set("pluggable_discovery.required.0", "builtin:serial-discovery")
 		platform.Properties.Set("pluggable_discovery.required.1", "builtin:mdns-discovery")
+		platform.Properties.Set("pluggable_monitor.required.serial", "builtin:serial-monitor")
 	}
 
 	if platform.Platform.Name == "" {
@@ -359,6 +360,19 @@ func (pm *PackageManager) loadPlatformRelease(platform *cores.PlatformRelease, p
 	if !platform.PluggableDiscoveryAware {
 		convertLegacyPlatformToPluggableDiscovery(platform)
 	}
+
+	// Build pluggable monitor references
+	platform.Monitors = map[string]*cores.MonitorDependency{}
+	for protocol, ref := range platform.Properties.SubTree("pluggable_monitor.required").AsMap() {
+		split := strings.Split(ref, ":")
+		if len(split) != 2 {
+			return fmt.Errorf(tr("invalid pluggable monitor reference: %s"), ref)
+		}
+		platform.Monitors[protocol] = &cores.MonitorDependency{
+			Packager: split[0],
+			Name:     split[1],
+		}
+	}
 	return nil
 }