Add gRPC interface for board list watcher

cli/board/list.go

@@ -25,7 +25,6 @@ import (
 	"github.com/arduino/arduino-cli/cli/errorcodes"
 	"github.com/arduino/arduino-cli/cli/feedback"
 	"github.com/arduino/arduino-cli/cli/instance"
-	"github.com/arduino/arduino-cli/commands"
 	"github.com/arduino/arduino-cli/commands/board"
 	rpc "github.com/arduino/arduino-cli/rpc/commands"
 	"github.com/arduino/arduino-cli/table"
@@ -90,8 +89,7 @@ func runListCommand(cmd *cobra.Command, args []string) {
 }
 
 func watchList(cmd *cobra.Command, inst *rpc.Instance) {
-	pm := commands.GetPackageManager(inst.Id)
-	eventsChan, err := commands.WatchListBoards(pm)
+	eventsChan, err := board.Watch(inst.Id, nil)
 	if err != nil {
 		feedback.Errorf("Error detecting boards: %v", err)
 		os.Exit(errorcodes.ErrNetwork)
@@ -105,28 +103,13 @@ func watchList(cmd *cobra.Command, inst *rpc.Instance) {
 	}
 
 	for event := range eventsChan {
-		boards := []*rpc.BoardListItem{}
-		if event.Type == "add" {
-			boards, err = board.Identify(pm, &commands.BoardPort{
-				Address:             event.Port.Address,
-				Label:               event.Port.AddressLabel,
-				Prefs:               event.Port.Properties,
-				IdentificationPrefs: event.Port.IdentificationProperties,
-				Protocol:            event.Port.Protocol,
-				ProtocolLabel:       event.Port.ProtocolLabel,
-			})
-			if err != nil {
-				feedback.Errorf("Error identifying board: %v", err)
-				os.Exit(errorcodes.ErrNetwork)
-			}
-		}
-
 		feedback.PrintResult(watchEvent{
-			Type:          event.Type,
+			Type:          event.EventType,
 			Address:       event.Port.Address,
 			Protocol:      event.Port.Protocol,
 			ProtocolLabel: event.Port.ProtocolLabel,
-			Boards:        boards,
+			Boards:        event.Port.Boards,
+			Error:         event.Error,
 		})
 	}
 }
@@ -198,6 +181,7 @@ type watchEvent struct {
 	Protocol      string               `json:"protocol,omitempty"`
 	ProtocolLabel string               `json:"protocol_label,omitempty"`
 	Boards        []*rpc.BoardListItem `json:"boards,omitempty"`
+	Error         string               `json:"error,omitempty"`
 }
 
 func (dr watchEvent) Data() interface{} {

client_example/go.sum

@@ -10,6 +10,7 @@ github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRF
 github.com/arduino/board-discovery v0.0.0-20180823133458-1ba29327fb0c/go.mod h1:HK7SpkEax/3P+0w78iRQx1sz1vCDYYw9RXwHjQTB5i8=
 github.com/arduino/go-paths-helper v1.0.1/go.mod h1:HpxtKph+g238EJHq4geEPv9p+gl3v5YYu35Yb+w31Ck=
 github.com/arduino/go-paths-helper v1.2.0/go.mod h1:HpxtKph+g238EJHq4geEPv9p+gl3v5YYu35Yb+w31Ck=
+github.com/arduino/go-paths-helper v1.3.2/go.mod h1:HpxtKph+g238EJHq4geEPv9p+gl3v5YYu35Yb+w31Ck=
 github.com/arduino/go-properties-orderedmap v0.0.0-20190828172252-05018b28ff6c/go.mod h1:kiSuHm7yz3chiy8rb2MphC7ECn3MlkQFAIe4SXmQg6o=
 github.com/arduino/go-properties-orderedmap v1.3.0/go.mod h1:DKjD2VXY/NZmlingh4lSFMEYCVubfeArCsGPGDwb2yk=
 github.com/arduino/go-timeutils v0.0.0-20171220113728-d1dd9e313b1b/go.mod h1:uwGy5PpN4lqW97FiLnbcx+xx8jly5YuPMJWfVwwjJiQ=
@@ -20,10 +21,12 @@ github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+Ce
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cmaglie/go.rice v1.0.3/go.mod h1:AF3bOWkvdOpp8/S3UL8qbQ4N7DiISIbJtj54GWFPAsc=
 github.com/cmaglie/pb v1.0.27 h1:ynGj8vBXR+dtj4B7Q/W/qGt31771Ux5iFfRQBnwdQiA=
 github.com/cmaglie/pb v1.0.27/go.mod h1:GilkKZMXYjBA4NxItWFfO+lwkp59PLHQ+IOW/b/kmZI=
 github.com/codeclysm/cc v1.2.2/go.mod h1:XtW4ArCNgQwFphcRGG9+sPX5WM1J6/u0gMy5ZdV3obA=
 github.com/codeclysm/extract v2.2.0+incompatible/go.mod h1:2nhFMPHiU9At61hz+12bfrlpXSUrOnK+wR+KlGO4Uks=
+github.com/codeclysm/extract/v3 v3.0.2/go.mod h1:NKsw+hqua9H+Rlwy/w/3Qgt9jDonYEgB6wJu+25eOKw=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
@@ -82,16 +85,24 @@ github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoA
 github.com/grpc-ecosystem/go-grpc-middleware v1.0.0/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
 github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
 github.com/grpc-ecosystem/grpc-gateway v1.9.0/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
+github.com/h2non/filetype v1.0.6/go.mod h1:isekKqOuhMj+s/7r3rIeTErIRy4Rub5uBWHfvMusLMU=
 github.com/h2non/filetype v1.0.8/go.mod h1:isekKqOuhMj+s/7r3rIeTErIRy4Rub5uBWHfvMusLMU=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
 github.com/imjasonmiller/godice v0.1.2/go.mod h1:8cTkdnVI+NglU2d6sv+ilYcNaJ5VSTBwvMbFULJd/QQ=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
 github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
+github.com/juju/clock v0.0.0-20180524022203-d293bb356ca4/go.mod h1:nD0vlnrUjcjJhqN5WuCWZyzfd5AHZAC9/ajvbSx69xA=
+github.com/juju/errors v0.0.0-20150916125642-1b5e39b83d18/go.mod h1:W54LbzXuIE0boCoNJfwqpmkKJ1O4TCTZMetAt6jGk7Q=
 github.com/juju/errors v0.0.0-20181118221551-089d3ea4e4d5/go.mod h1:W54LbzXuIE0boCoNJfwqpmkKJ1O4TCTZMetAt6jGk7Q=
+github.com/juju/loggo v0.0.0-20170605014607-8232ab8918d9/go.mod h1:vgyd7OREkbtVEN/8IXZe5Ooef3LQePvuBm9UWj6ZL8U=
 github.com/juju/loggo v0.0.0-20190526231331-6e530bcce5d8/go.mod h1:vgyd7OREkbtVEN/8IXZe5Ooef3LQePvuBm9UWj6ZL8U=
+github.com/juju/retry v0.0.0-20160928201858-1998d01ba1c3/go.mod h1:OohPQGsr4pnxwD5YljhQ+TZnuVRYpa5irjugL1Yuif4=
 github.com/juju/testing v0.0.0-20190429233213-dfc56b8c09fc/go.mod h1:63prj8cnj0tU0S9OHjGJn+b1h0ZghCndfnbQolrYTwA=
+github.com/juju/testing v0.0.0-20200510222523-6c8c298c77a0/go.mod h1:hpGvhGHPVbNBraRLZEhoQwFLMrjK8PSlO4D3nDjKYXo=
+github.com/juju/utils v0.0.0-20180808125547-9dfc6dbfb02b/go.mod h1:6/KLg8Wz/y2KVGWEpkK9vMNGkOnu4k/cqs8Z1fKjTOk=
+github.com/juju/version v0.0.0-20161031051906-1f41e27e54f2/go.mod h1:kE8gK5X0CImdr7qpSKl3xB2PmpySSmfj7zVbkZFs81U=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
 github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
@@ -117,7 +128,9 @@ github.com/miekg/dns v1.0.5/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nr
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
+github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
 github.com/nkovacs/streamquote v0.0.0-20170412213628-49af9bddb229/go.mod h1:0aYXnNPJ8l7uZxf45rWW1a/uME32OF0rhiYGNQ2oF2E=
+github.com/nkovacs/streamquote v1.0.0/go.mod h1:BN+NaZ2CmdKqUuTUXUEm9j95B2TRbpOWpxbJYzzgUsc=
 github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
 github.com/oleksandr/bonjour v0.0.0-20160508152359-5dcf00d8b228/go.mod h1:MGuVJ1+5TX1SCoO2Sx0eAnjpdRytYla2uC1YIZfkC9c=
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
@@ -180,18 +193,21 @@ go.bug.st/downloader v1.1.0/go.mod h1:l+RPbNbrTB+MoAIp8nrZsP22nRPDy26XJZQqmm4gNT
 go.bug.st/downloader/v2 v2.0.1/go.mod h1:VZW2V1iGKV8rJL2ZEGIDzzBeKowYv34AedJz13RzVII=
 go.bug.st/relaxed-semver v0.0.0-20190922224835-391e10178d18/go.mod h1:Cx1VqMtEhE9pIkEyUj3LVVVPkv89dgW8aCKrRPDR/uE=
 go.bug.st/serial v1.0.0/go.mod h1:rpXPISGjuNjPTRTcMlxi9lN6LoIPxd1ixVjBd8aSk/Q=
+go.bug.st/serial v1.1.1/go.mod h1:VmYBeyJWp5BnJ0tw2NUJHZdJTGl2ecBGABHlzRK1knY=
 go.bug.st/serial.v1 v0.0.0-20180827123349-5f7892a7bb45/go.mod h1:dRSl/CVCTf56CkXgJMDOdSwNfo2g1orOGE/gBGdvjZw=
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
 go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
+golang.org/x/crypto v0.0.0-20180214000028-650f4a345ab4/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
+golang.org/x/net v0.0.0-20180406214816-61147c48b25b/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -222,6 +238,8 @@ golang.org/x/sys v0.0.0-20191128015809-6d18c012aee9 h1:ZBzSG/7F4eNKz2L3GE9o300RX
 golang.org/x/sys v0.0.0-20191128015809-6d18c012aee9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5 h1:LfCXLvNmTYH9kEmVgqbnsWfruoXZIrh4YBgqVHtDvw0=
 golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200909081042-eff7692f9009 h1:W0lCpv29Hv0UaM1LXb9QlBHLNP8UFfcKjblhVCWftOM=
+golang.org/x/sys v0.0.0-20200909081042-eff7692f9009/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
@@ -261,11 +279,15 @@ google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20160105164936-4f90aeace3a2/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/mgo.v2 v2.0.0-20160818015218-f2b6f6c918c4/go.mod h1:yeKp02qBN3iKW1OzL3MGk2IdtZzaj7SFntXj72NppTA=
 gopkg.in/mgo.v2 v2.0.0-20180705113604-9856a29383ce/go.mod h1:yeKp02qBN3iKW1OzL3MGk2IdtZzaj7SFntXj72NppTA=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
+gopkg.in/yaml.v2 v2.0.0-20170712054546-1be3d31502d6/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
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client_example/main.go

@@ -26,6 +26,7 @@ import (
 	"path"
 	"path/filepath"
 	"strings"
+	"time"
 
 	rpc "github.com/arduino/arduino-cli/rpc/commands"
 	dbg "github.com/arduino/arduino-cli/rpc/debug"
@@ -154,6 +155,10 @@ func main() {
 	log.Println("calling BoardList()")
 	callBoardList(client, instance)
 
+	// Watch for boards connection and disconnection
+	log.Println("calling BoardListWatch()")
+	callBoardListWatch(client, instance)
+
 	// Uninstall a platform
 	log.Println("calling PlatformUninstall(arduino:samd)")
 	callPlatformUnInstall(client, instance)
@@ -592,6 +597,41 @@ func callBoardList(client rpc.ArduinoCoreClient, instance *rpc.Instance) {
 	}
 }
 
+func callBoardListWatch(client rpc.ArduinoCoreClient, instance *rpc.Instance) {
+	watchClient, err := client.BoardListWatch(context.Background())
+	if err != nil {
+		log.Fatalf("Board list watch error: %s\n", err)
+	}
+
+	// Start the watcher
+	watchClient.Send(&rpc.BoardListWatchReq{
+		Instance: instance,
+	})
+
+	go func() {
+		for {
+			res, err := watchClient.Recv()
+			if err != nil {
+				log.Fatalf("Board list watch error: %s\n", err)
+			}
+
+			log.Printf("event: %s, address: %s\n", res.EventType, res.Port.Address)
+			if res.EventType == "add" {
+				log.Printf("protocol: %s, ", res.Port.Protocol)
+				log.Printf("protocolLabel: %s, ", res.Port.ProtocolLabel)
+				log.Printf("boards: %s\n\n", res.Port.Boards)
+			}
+		}
+	}()
+
+	// Watch for 10 seconds and then interrupts
+	timer := time.NewTicker(time.Duration(10 * time.Second))
+	<-timer.C
+	watchClient.Send(&rpc.BoardListWatchReq{
+		Interrupt: true,
+	})
+}
+
 func callPlatformUnInstall(client rpc.ArduinoCoreClient, instance *rpc.Instance) {
 	uninstallRespStream, err := client.PlatformUninstall(context.Background(),
 		&rpc.PlatformUninstallReq{

commands/board/list.go

@@ -108,8 +108,8 @@ func identifyViaCloudAPI(port *commands.BoardPort) ([]*rpc.BoardListItem, error)
 	return apiByVidPid(id.Get("vid"), id.Get("pid"))
 }
 
-// Identify returns a list of boards checking first the installed platforms or the Cloud API
-func Identify(pm *packagemanager.PackageManager, port *commands.BoardPort) ([]*rpc.BoardListItem, error) {
+// identify returns a list of boards checking first the installed platforms or the Cloud API
+func identify(pm *packagemanager.PackageManager, port *commands.BoardPort) ([]*rpc.BoardListItem, error) {
 	boards := []*rpc.BoardListItem{}
 
 	// first query installed cores through the Package Manager
@@ -169,7 +169,7 @@ func List(instanceID int32) (r []*rpc.DetectedPort, e error) {
 
 	retVal := []*rpc.DetectedPort{}
 	for _, port := range ports {
-		boards, err := Identify(pm, port)
+		boards, err := identify(pm, port)
 		if err != nil {
 			return nil, err
 		}
@@ -187,3 +187,52 @@ func List(instanceID int32) (r []*rpc.DetectedPort, e error) {
 
 	return retVal, nil
 }
+
+// Watch returns a channel that receives boards connection and disconnection events.
+// The discovery process can be interrupted by sending a message to the interrupt channel.
+func Watch(instanceID int32, interrupt <-chan bool) (<-chan *rpc.BoardListWatchResp, error) {
+	pm := commands.GetPackageManager(instanceID)
+	eventsChan, err := commands.WatchListBoards(pm)
+	if err != nil {
+		return nil, err
+	}
+
+	outChan := make(chan *rpc.BoardListWatchResp)
+	go func() {
+		for {
+			select {
+			case event := <-eventsChan:
+				boards := []*rpc.BoardListItem{}
+				boardsError := ""
+				if event.Type == "add" {
+					boards, err = identify(pm, &commands.BoardPort{
+						Address:             event.Port.Address,
+						Label:               event.Port.AddressLabel,
+						Prefs:               event.Port.Properties,
+						IdentificationPrefs: event.Port.IdentificationProperties,
+						Protocol:            event.Port.Protocol,
+						ProtocolLabel:       event.Port.ProtocolLabel,
+					})
+					if err != nil {
+						boardsError = err.Error()
+					}
+				}
+
+				outChan <- &rpc.BoardListWatchResp{
+					EventType: event.Type,
+					Port: &rpc.DetectedPort{
+						Address:       event.Port.Address,
+						Protocol:      event.Port.Protocol,
+						ProtocolLabel: event.Port.ProtocolLabel,
+						Boards:        boards,
+					},
+					Error: boardsError,
+				}
+			case <-interrupt:
+				break
+			}
+		}
+	}()
+
+	return outChan, nil
+}

commands/daemon/daemon.go

@@ -19,6 +19,7 @@ package daemon
 
 import (
 	"context"
+	"io"
 
 	"github.com/arduino/arduino-cli/arduino/utils"
 	"github.com/arduino/arduino-cli/commands"
@@ -58,6 +59,39 @@ func (s *ArduinoCoreServerImpl) BoardListAll(ctx context.Context, req *rpc.Board
 	return board.ListAll(ctx, req)
 }
 
+// BoardListWatch FIXMEDOC
+func (s *ArduinoCoreServerImpl) BoardListWatch(stream rpc.ArduinoCore_BoardListWatchServer) error {
+	msg, err := stream.Recv()
+	if err == io.EOF {
+		return nil
+	}
+	if err != nil {
+		return err
+	}
+
+	interrupt := make(chan bool)
+	go func() {
+		msg, err := stream.Recv()
+		if err != nil {
+			interrupt <- true
+		}
+		if msg != nil {
+			interrupt <- msg.Interrupt
+		}
+	}()
+
+	eventsChan, err := board.Watch(msg.Instance.Id, interrupt)
+	if err != nil {
+		return err
+	}
+
+	for event := range eventsChan {
+		stream.Send(event)
+	}
+
+	return nil
+}
+
 // BoardAttach FIXMEDOC
 func (s *ArduinoCoreServerImpl) BoardAttach(req *rpc.BoardAttachReq, stream rpc.ArduinoCore_BoardAttachServer) error {