fix: handle RouterOS version returned as list of integers

Some MikroTik devices return the version OID as a list of integers
[7, 20, 6] instead of a binary string "7.20.6". Added pattern match
to detect_version/1 to handle this case and convert to dotted string.

Fixes warning: "Failed to detect version: {:ok, [7, 20, 6]}"

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

CHANGELOG.txt

@@ -1,6 +1,16 @@
 CHANGELOG - towerops-web
 ========================
 
+2026-02-11 - fix: handle RouterOS version returned as list of integers
+  - File: lib/towerops/snmp/profiles/vendors/routeros.ex (detect_version/1)
+    Added pattern match to handle case where SNMP version OID returns list
+    of integers [7, 20, 6] instead of binary string "7.20.6". Converts list
+    to dotted string format using Enum.join/2.
+  - File: test/towerops/snmp/profiles/vendors/routeros_test.exs
+    Added two test cases for list-formatted versions with and without license level.
+  - Bug: Warning logged "Failed to detect version: {:ok, [7, 20, 6]}" even though
+    version was successfully retrieved, just in wrong format.
+
 2026-02-11 - fix: normalize OIDs so agent-polled sensors match regardless of leading dot
   - File: lib/towerops_web/channels/agent_channel.ex
     Agent (gosnmp) returns OIDs with leading dots (e.g. ".1.3.6.1.4.1.41112...")

lib/towerops/snmp/profiles/vendors/routeros.ex

@@ -93,6 +93,24 @@ defmodule Towerops.Snmp.Profiles.Vendors.Routeros do
         Logger.debug("RouterOS: Detected version: #{formatted_version}")
         formatted_version
 
+      {:ok, version} when is_list(version) ->
+        # Version came back as list of integers like [7, 20, 6]
+        # Convert to dotted string format
+        version_string = Enum.join(version, ".")
+        license_level = detect_license_level(client_opts)
+
+        formatted_version =
+          case license_level do
+            level when is_integer(level) ->
+              "RouterOS #{version_string} (Level #{level})"
+
+            _ ->
+              "RouterOS #{version_string}"
+          end
+
+        Logger.debug("RouterOS: Detected version: #{formatted_version}")
+        formatted_version
+
       other ->
         Logger.warning("RouterOS: Failed to detect version: #{inspect(other)}")
         nil

test/towerops/snmp/profiles/vendors/routeros_test.exs

@@ -118,6 +118,24 @@ defmodule Towerops.Snmp.Profiles.Vendors.RouterosTest do
 
       assert Routeros.detect_version(@client_opts) == nil
     end
+
+    test "handles version returned as list of integers" do
+      expect(SnmpMock, :get, 2, fn
+        _, @version_oid, _ -> {:ok, [7, 20, 6]}
+        _, @license_level_oid, _ -> {:ok, 6}
+      end)
+
+      assert Routeros.detect_version(@client_opts) == "RouterOS 7.20.6 (Level 6)"
+    end
+
+    test "handles version returned as list of integers without license level" do
+      expect(SnmpMock, :get, 2, fn
+        _, @version_oid, _ -> {:ok, [6, 48, 3]}
+        _, @license_level_oid, _ -> {:error, :timeout}
+      end)
+
+      assert Routeros.detect_version(@client_opts) == "RouterOS 6.48.3"
+    end
   end
 
   describe "detect_serial_number/1" do