fix agent discovery system OIDs returning no_such_name

gosnmp returns OIDs with leading dots (e.g., ".1.3.6.1.2.1.1.1.0")
but the Replay adapter did exact-match lookups without the dot.
Walks already normalized both sides, so interfaces worked. GETs
did not, breaking all system OID resolution (sysDescr, sysName, etc).

lib/towerops/snmp/adapters/replay.ex

@@ -73,16 +73,27 @@ defmodule Towerops.Snmp.Adapters.Replay do
   def get(opts, oid) when is_binary(oid) do
     oid_map = Keyword.fetch!(opts, :oid_map)
 
-    case Map.fetch(oid_map, oid) do
+    case lookup_oid(oid_map, oid) do
       {:ok, value} ->
         {:ok, parse_value(value)}
 
       :error ->
-        # Mimic SNMP "no such name" error
         {:error, :no_such_name}
     end
   end
 
+  # Normalize OID lookup to handle leading dot differences.
+  # gosnmp returns OIDs with leading dots (e.g., ".1.3.6.1.2.1.1.1.0")
+  # but server code uses OIDs without (e.g., "1.3.6.1.2.1.1.1.0").
+  defp lookup_oid(oid_map, oid) do
+    normalized = String.trim_leading(oid, ".")
+
+    with :error <- Map.fetch(oid_map, oid),
+         :error <- Map.fetch(oid_map, normalized) do
+      Map.fetch(oid_map, "." <> normalized)
+    end
+  end
+
   @impl true
   def walk(opts, base_oid) when is_binary(base_oid) do
     oid_map = Keyword.fetch!(opts, :oid_map)

lib/towerops_web/live/device_live/show.html.heex

@@ -1865,7 +1865,10 @@
               <p>
                 Raw SNMP OID values collected during the last discovery run at
                 <%= if @snmp_device.last_discovery_at do %>
-                  {ToweropsWeb.TimeHelpers.format_iso8601(@snmp_device.last_discovery_at, @timezone)}
+                  {ToweropsWeb.TimeHelpers.format_iso8601(
+                    @snmp_device.last_discovery_at,
+                    @timezone
+                  )}
                 <% else %>
                   unknown time
                 <% end %>.

test/towerops/snmp/adapters/replay_test.exs

@@ -229,6 +229,51 @@ defmodule Towerops.Snmp.Adapters.ReplayTest do
     end
   end
 
+  describe "leading dot normalization (gosnmp format)" do
+    test "get/2 finds value when map has leading-dot keys" do
+      # gosnmp returns OIDs like ".1.3.6.1.2.1.1.1.0" (with leading dot)
+      # but server code looks up "1.3.6.1.2.1.1.1.0" (without leading dot)
+      oid_map = %{".1.3.6.1.2.1.1.1.0" => "RouterOS CHR"}
+      opts = Replay.new(oid_map)
+
+      assert {:ok, "RouterOS CHR"} = Replay.get(opts, "1.3.6.1.2.1.1.1.0")
+    end
+
+    test "get/2 finds value when map has no-dot keys but lookup has dot" do
+      oid_map = %{"1.3.6.1.2.1.1.1.0" => "Cisco IOS"}
+      opts = Replay.new(oid_map)
+
+      assert {:ok, "Cisco IOS"} = Replay.get(opts, ".1.3.6.1.2.1.1.1.0")
+    end
+
+    test "get_multiple/2 finds values with mixed dot formats" do
+      oid_map = %{
+        ".1.3.6.1.2.1.1.1.0" => "RouterOS CHR",
+        ".1.3.6.1.2.1.1.5.0" => "mikrotik-router"
+      }
+
+      opts = Replay.new(oid_map)
+
+      oids = ["1.3.6.1.2.1.1.1.0", "1.3.6.1.2.1.1.5.0"]
+
+      assert {:ok, results} = Replay.get_multiple(opts, oids)
+      assert results["1.3.6.1.2.1.1.1.0"] == "RouterOS CHR"
+      assert results["1.3.6.1.2.1.1.5.0"] == "mikrotik-router"
+    end
+
+    test "walk/2 handles leading-dot keys in map" do
+      oid_map = %{
+        ".1.3.6.1.2.1.2.2.1.1.1" => "1",
+        ".1.3.6.1.2.1.2.2.1.1.2" => "2"
+      }
+
+      opts = Replay.new(oid_map)
+
+      assert {:ok, results} = Replay.walk(opts, "1.3.6.1.2.1.2.2.1.1")
+      assert length(results) == 2
+    end
+  end
+
   describe "type inference edge cases" do
     test "parses MAC address with hyphens" do
       oid_map = %{"oid" => "AA-BB-CC-DD-EE-FF"}