chore: Bring back ability to use a custom logger

modbus.go

@@ -8,7 +8,9 @@ Package modbus provides a client for MODBUS TCP and RTU/ASCII.
 package modbus
 
 import (
+	"context"
 	"fmt"
+	"log/slog"
 )
 
 const (
@@ -116,3 +118,16 @@ type Connector interface {
 	Connect() error
 	Close() error
 }
+
+// Logger is an interface to define custom loggers
+type Logger interface {
+	Debug(string, ...any)
+	DebugContext(context.Context, string, ...any)
+	Info(string, ...any)
+	InfoContext(context.Context, string, ...any)
+	Warn(string, ...any)
+	WarnContext(context.Context, string, ...any)
+	Error(string, ...any)
+	ErrorContext(context.Context, string, ...any)
+	Log(context.Context, slog.Level, string, ...any)
+}

rtu_over_udp_client.go

@@ -3,7 +3,6 @@ package modbus
 import (
 	"fmt"
 	"io"
-	logger "log/slog"
 	"net"
 	"sync"
 )
@@ -46,7 +45,7 @@ type rtuUDPTransporter struct {
 	// Connect string
 	Address string
 	// Transmission logger
-	Logger *logger.Logger
+	Logger Logger
 
 	// UDP connection
 	mu   sync.Mutex

serial.go

@@ -8,7 +8,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"log/slog"
 	"sync"
 	"time"
 
@@ -26,7 +25,7 @@ type serialPort struct {
 	// Serial port configuration.
 	serial.Config
 
-	Logger      *slog.Logger
+	Logger      Logger
 	IdleTimeout time.Duration
 
 	mu sync.Mutex

tcpclient.go

@@ -9,7 +9,6 @@ import (
 	"encoding/binary"
 	"fmt"
 	"io"
-	"log/slog"
 	"net"
 	"sync"
 	"sync/atomic"
@@ -138,7 +137,7 @@ type tcpTransporter struct {
 	// Silent period after successful connection
 	ConnectDelay time.Duration
 	// Transmission logger
-	Logger *slog.Logger
+	Logger Logger
 
 	// TCP connection
 	mu           sync.Mutex