Rewrite everything from scratch for mqtt v5

vendor/github.com/alicebob/miniredis/v2/cmd_info.go

@@ -0,0 +1,40 @@
+package miniredis
+
+import (
+	"fmt"
+
+	"github.com/alicebob/miniredis/v2/server"
+)
+
+// Command 'INFO' from https://redis.io/commands/info/
+func (m *Miniredis) cmdInfo(c *server.Peer, cmd string, args []string) {
+	if !m.isValidCMD(c, cmd) {
+		return
+	}
+
+	if len(args) > 1 {
+		setDirty(c)
+		c.WriteError(errWrongNumber(cmd))
+		return
+	}
+
+	withTx(m, c, func(c *server.Peer, ctx *connCtx) {
+		const (
+			clientsSectionName    = "clients"
+			clientsSectionContent = "# Clients\nconnected_clients:%d\r\n"
+		)
+
+		var result string
+
+		for _, key := range args {
+			if key != clientsSectionName {
+				setDirty(c)
+				c.WriteError(fmt.Sprintf("section (%s) is not supported", key))
+				return
+			}
+		}
+		result = fmt.Sprintf(clientsSectionContent, m.Server().ClientsLen())
+
+		c.WriteBulk(result)
+	})
+}