diff --git a/files/ansible-playbooks/sot-updater.yml b/files/ansible-playbooks/sot-updater.yml
index 007972d..2720718 100644
--- a/files/ansible-playbooks/sot-updater.yml
+++ b/files/ansible-playbooks/sot-updater.yml
@@ -177,7 +177,6 @@
         nb_small: "{{ nb_kv.get('small','') }}"
         nb_ok_line: "{{ nb_ok_line }}"
 
-
     - name: "NB preflight | Detect IP change"
       when: nb_script.stat.exists
       delegate_to: localhost
@@ -820,6 +819,29 @@
           payload_encoding: "string"
       changed_when: false
 
+    # ----------------------- Dev1 hostname (for Dev2 mismatch check) -----------------------
+    - name: Dev1 | Read kernel hostname
+      delegate_to: localhost
+      shell: |
+        sshpass -p '{{ dev1_pass }}' ssh {{ ssh_opts_common }} \
+          "{{ dev1_user }}@{{ ansible_host|default(inventory_hostname) }}" \
+          "cat /proc/sys/kernel/hostname 2>/dev/null || hostname 2>/dev/null || echo ''"
+      args:
+        executable: /bin/bash
+      register: dev1_hostname_raw
+      changed_when: false
+      failed_when: false
+      ignore_errors: true
+
+    - name: Dev1 | Normalize hostname
+      delegate_to: localhost
+      set_fact:
+        dev1_hostname: >-
+          {{
+            (dev1_hostname_raw.stdout | default('') | trim)
+            if ((dev1_hostname_raw.stdout | default('') | trim | length) > 0)
+            else (inventory_hostname | default(''))
+          }}
 
     # ----------------------- Dev2 auth + firmux -----------------------
     - name: Try DEV2 login
@@ -1002,7 +1024,6 @@
       ignore_errors: true
 
     # ------ LLDP IPv6 fallback (Dev1 → Dev2 on link-local) ------
-
     - name: Dev1 | Try LLDP-derived Dev2 IPv6 (auth to Dev2 failed, IPv4 LLDP unusable)
       when:
         - tunnel_ok | default(false)
@@ -1100,7 +1121,6 @@
         msg:
           - "LLDP IPv6 candidate={{ lldp_dev2_ip6 | default('<none>') }}"
           - "LLDP IPv6 auth rc={{ dev2_auth_lldp6.rc | default('n/a') }}"
-          - "LLDP IPv6 auth stdout='{{ dev2_auth_lldp6.stdout | default('') | trim }}'"
 
     - name: Set dev2_passfile_used_lldp6
       when:
@@ -1160,7 +1180,6 @@
       failed_when: false
       ignore_errors: true
 
-
     - name: Dev2 | Read firmux (direct LLDP IP)
       when:
         - tunnel_ok | default(false)
@@ -1195,7 +1214,6 @@
             )
           }}
 
-
     - name: Dev2 | firmux selection debug
       delegate_to: localhost
       debug:
@@ -1320,7 +1338,6 @@
       failed_when: false
       ignore_errors: true
 
-
     - name: Dev2 | Select fw_printenv size output
       delegate_to: localhost
       set_fact:
@@ -1351,7 +1368,6 @@
             )
           }}
 
-
     - name: Dev2 | Normalize indoor_bootenv value
       delegate_to: localhost
       set_fact:
@@ -1385,7 +1401,153 @@
           payload_encoding: "string"
       changed_when: false
 
+    # ----------------------- Dev2 hostname check + publish -----------------------
+    - name: Dev2 | Read hostname (tunnel)
+      when:
+        - tunnel_ok | default(false)
+        - dev2_passfile_used != 'NONE'
+      delegate_to: localhost
+      shell: |
+        PORT="{{ _local_port }}"
+        sshpass -f "{{ dev2_passfile_used }}" ssh {{ ssh_opts_common }} \
+          -o ConnectTimeout={{ ssh_timeout }} \
+          -p "$PORT" "{{ dev2_ssh_user }}@127.0.0.1" \
+          "cat /proc/sys/kernel/hostname 2>/dev/null || hostname 2>/dev/null || echo ''"
+      args:
+        executable: /bin/bash
+      register: dev2_hostname_tunnel
+      changed_when: false
+      failed_when: false
+      ignore_errors: true
 
+    - name: Dev2 | Read hostname (LLDP IPv4)
+      when:
+        - tunnel_ok | default(false)
+        - dev2_passfile_used == 'NONE'
+        - lldp_dev2_ip | length > 0
+        - dev2_passfile_used_lldp is defined
+        - dev2_passfile_used_lldp != 'NONE'
+      delegate_to: localhost
+      shell: |
+        sshpass -f "{{ dev2_passfile_used_lldp }}" ssh \
+          -o StrictHostKeyChecking=no -o PubkeyAuthentication=no \
+          -o ConnectTimeout=15 \
+          "{{ dev2_ssh_user }}@{{ lldp_dev2_ip }}" \
+          "cat /proc/sys/kernel/hostname 2>/dev/null || hostname 2>/dev/null || echo ''"
+      args:
+        executable: /bin/bash
+      register: dev2_hostname_lldp
+      changed_when: false
+      failed_when: false
+      ignore_errors: true
+
+    - name: Dev2 | Read hostname (LLDP IPv6 via Dev1)
+      when:
+        - tunnel_ok | default(false)
+        - dev2_passfile_used == 'NONE'
+        - (dev2_passfile_used_lldp is not defined or dev2_passfile_used_lldp == 'NONE')
+        - lldp_dev2_ip6 is defined
+        - lldp_dev2_ip6 | length > 0
+        - dev2_passfile_used_lldp6 is defined
+        - dev2_passfile_used_lldp6 != 'NONE'
+      delegate_to: localhost
+      shell: |
+        IP6="{{ lldp_dev2_ip6 }}"
+        F="{{ dev2_passfile_used_lldp6 }}"
+        if [ -z "$IP6" ] || [ -z "$F" ] || [ "$F" = "NONE" ]; then
+          exit 0
+        fi
+
+        sshpass -p '{{ dev1_pass }}' ssh {{ ssh_opts_common }} \
+          "{{ dev1_user }}@{{ ansible_host|default(inventory_hostname) }}" \
+          "sshpass -f '/tmp/${F}' ssh \
+             -o StrictHostKeyChecking=no -o PubkeyAuthentication=no \
+             -o ConnectTimeout={{ ssh_timeout }} \
+             '{{ dev2_ssh_user }}@\[${IP6}%{{ dev1_iface }}\]' \
+             'cat /proc/sys/kernel/hostname 2>/dev/null || hostname 2>/dev/null || echo '''"
+      args:
+        executable: /bin/bash
+      register: dev2_hostname_lldp6
+      changed_when: false
+      failed_when: false
+      ignore_errors: true
+
+    - name: Dev2 | Select hostname output
+      delegate_to: localhost
+      set_fact:
+        indoor_hostname_raw: >-
+          {{
+            (dev2_hostname_tunnel.stdout | default('') | trim)
+            if (
+              (dev2_hostname_tunnel is defined) and
+              ((dev2_hostname_tunnel.stdout | default('') | trim | length) > 0)
+            )
+            else (
+              (dev2_hostname_lldp.stdout | default('') | trim)
+              if (
+                (dev2_hostname_lldp is defined) and
+                ((dev2_hostname_lldp.stdout | default('') | trim | length) > 0)
+              )
+              else (
+                (dev2_hostname_lldp6.stdout | default('') | trim)
+                if (
+                  (dev2_hostname_lldp6 is defined) and
+                  ((dev2_hostname_lldp6.stdout | default('') | trim | length) > 0)
+                )
+                else ''
+              )
+            )
+          }}
+
+    - name: Dev2 | Normalize indoor_hostname
+      delegate_to: localhost
+      set_fact:
+        indoor_hostname_value: >-
+          {{
+            'unavailable'
+            if (indoor_hostname_raw | default('') | trim) == ''
+            else (
+              (
+                '!' ~ (indoor_hostname_raw | default('') | trim)
+              )
+              if (
+                (dev1_hostname | default(inventory_hostname))
+                != (indoor_hostname_raw | default('') | trim)
+              )
+              else (indoor_hostname_raw | default('') | trim)
+            )
+          }}
+
+    - name: Dev2 | indoor_hostname debug
+      delegate_to: localhost
+      debug:
+        msg:
+          - "dev1_hostname={{ dev1_hostname | default('n/a') }}"
+          - "indoor_hostname_raw={{ indoor_hostname_raw | default('n/a') }}"
+          - "indoor_hostname_value={{ indoor_hostname_value | default('n/a') }}"
+
+    - name: Publish Dev2 indoor_hostname custom field
+      delegate_to: localhost
+      uri:
+        url: "http://{{ rmq_host }}:{{ rmq_port }}/api/exchanges/{{ rmq_vhost|urlencode }}/{{ rmq_exchange|urlencode }}/publish"
+        method: POST
+        user: "{{ rmq_user }}"
+        password: "{{ rmq_pass }}"
+        force_basic_auth: true
+        status_code: 200
+        headers: { content-type: "application/json" }
+        body_format: json
+        body:
+          properties: { content_type: "application/json" }
+          routing_key: "{{ control_queue }}"
+          payload: "{{ {
+            'inscope_device': (ansible_hostname|default(inventory_hostname)),
+            'task_name': 'custom_field_set',
+            'task_add1': 'indoor_hostname',
+            'task_result': indoor_hostname_value
+          } | to_json }}"
+          payload_encoding: "string"
+      changed_when: false
 
   post_tasks:
     - name: "✅ Cleanup start"