Configure semtechudp cache expiration and cleanup interval

chirpstack · Dec 9, 2024 · 2f9d840 · 2f9d840
1 parent ea8985d
commit 2f9d840
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Showing 4 changed files with 25 additions and 5 deletions.
diff --git a/cmd/chirpstack-gateway-bridge/cmd/configfile.go b/cmd/chirpstack-gateway-bridge/cmd/configfile.go
@@ -95,6 +95,18 @@ type="{{ .Backend.Type }}"
   # disconnected and it will unsubscribe from the gateway MQTT topic and cleanup the UDP docket. 
   connection_timeout_duration={{ .Backend.SemtechUDP.CleanupDuration }}
 
+  # Cache expiration
+  #
+  # ChirpStack Gateway Bridge temporarily store downlinks. If a gateway does not send any
+  # UDP data within the configured timeout the downlink is discarded.
+  cache_default_expiration={{ .Backend.SemtechUDP.CacheDefaultExpiration }}
+
+  # Cache cleanup interval
+  #
+  # ChirpStack Gateway Bridge temporarily store downlinks in a cache. The cache is cleaned in 
+  # the configured interval.
+  cache_cleanup_interval={{ .Backend.SemtechUDP.CacheCleanupInterval }}
+
   # ChirpStack Concentratord backend.
   [backend.concentratord]
 

diff --git a/cmd/chirpstack-gateway-bridge/cmd/root.go b/cmd/chirpstack-gateway-bridge/cmd/root.go
@@ -41,6 +41,9 @@ func init() {
 	viper.SetDefault("backend.semtech_udp.udp_bind", "0.0.0.0:1700")
 	viper.SetDefault("backend.semtech_udp.cleanup_duration", time.Minute)
 
+	viper.SetDefault("backend.semtech_udp.cache_default_expiration", 15*time.Second)
+	viper.SetDefault("backend.semtech_udp.cache_cleanup_interval", 15*time.Second)
+
 	viper.SetDefault("backend.concentratord.crc_check", true)
 	viper.SetDefault("backend.concentratord.event_url", "ipc:///tmp/concentratord_event")
 	viper.SetDefault("backend.concentratord.command_url", "ipc:///tmp/concentratord_command")

diff --git a/internal/backend/semtechudp/backend.go b/internal/backend/semtechudp/backend.go
@@ -72,7 +72,10 @@ func NewBackend(conf config.Config) (*Backend, error) {
 		},
 		fakeRxTime:   conf.Backend.SemtechUDP.FakeRxTime,
 		skipCRCCheck: conf.Backend.SemtechUDP.SkipCRCCheck,
-		cache:        cache.New(15*time.Second, 15*time.Second),
+		cache: cache.New(
+			time.Duration(conf.Backend.SemtechUDP.CacheDefaultExpiration),
+			time.Duration(conf.Backend.SemtechUDP.CacheCleanupInterval),
+		),
 	}
 
 	go func() {

diff --git a/internal/config/config.go b/internal/config/config.go
@@ -21,10 +21,12 @@ type Config struct {
 		Type string `mapstructure:"type"`
 
 		SemtechUDP struct {
-			UDPBind         string `mapstructure:"udp_bind"`
-			SkipCRCCheck    bool   `mapstructure:"skip_crc_check"`
-			FakeRxTime      bool   `mapstructure:"fake_rx_time"`
-			CleanupDuration int    `mapstructure:"connection_timeout_duration"`
+			UDPBind                string `mapstructure:"udp_bind"`
+			SkipCRCCheck           bool   `mapstructure:"skip_crc_check"`
+			FakeRxTime             bool   `mapstructure:"fake_rx_time"`
+			CleanupDuration        int    `mapstructure:"connection_timeout_duration"`
+			CacheDefaultExpiration int    `mapstructure:"cache_default_expiration"`
+			CacheCleanupInterval   int    `mapstructure:"cache_cleanup_interval"`
 		} `mapstructure:"semtech_udp"`
 
 		BasicStation struct {