Update chirpstack-api + update code.

Author: brocaar

go.mod

@@ -4,7 +4,7 @@ go 1.17
 
 require (
 	github.com/brocaar/lorawan v0.0.0-20220207095711-d675789e16ab
-	github.com/chirpstack/chirpstack/api/go/v4 v4.0.0
+	github.com/chirpstack/chirpstack/api/go/v4 v4.1.0
 	github.com/eclipse/paho.mqtt.golang v1.4.1
 	github.com/go-zeromq/zmq4 v0.7.0
 	github.com/golang-jwt/jwt/v4 v4.4.2

go.sum

@@ -99,8 +99,8 @@ github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghf
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cespare/xxhash/v2 v2.1.2 h1:YRXhKfTDauu4ajMg1TPgFO5jnlC2HCbmLXMcTG5cbYE=
 github.com/cespare/xxhash/v2 v2.1.2/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/chirpstack/chirpstack/api/go/v4 v4.0.0 h1:r5MFucv1+m4xSF7EGCF1w39ergR8CxBjLvHOexwYWp8=
-github.com/chirpstack/chirpstack/api/go/v4 v4.0.0/go.mod h1:KBW7imf70O9ifrMmoFH8+dn0+MUFS1PdC5shXH7W3dI=
+github.com/chirpstack/chirpstack/api/go/v4 v4.1.0 h1:D3ViDwYMmB9yE050i8EbqkGkIkPz8w4NwkdbPk1iat8=
+github.com/chirpstack/chirpstack/api/go/v4 v4.1.0/go.mod h1:KBW7imf70O9ifrMmoFH8+dn0+MUFS1PdC5shXH7W3dI=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=

internal/forwarder/forwarder.go

@@ -76,11 +76,11 @@ func gatewayStatsFunc(pl *gw.GatewayStats) {
 		}
 
 		// add meta-data to stats
-		if pl.MetaData == nil {
-			pl.MetaData = make(map[string]string)
+		if pl.Metadata == nil {
+			pl.Metadata = make(map[string]string)
 		}
 		for k, v := range metadata.Get() {
-			pl.MetaData[k] = v
+			pl.Metadata[k] = v
 		}
 
 		if err := integration.GetIntegration().PublishEvent(gatewayID, integration.EventStats, 0, pl); err != nil {