This playbook is for updating Mikrotik routers. It will update both the RouterOS version and the firmware.

The playbook executes in the following order.

1. Check for RouterOS Updates
2. Update RouterOS (Router will reboot if there is an update)
3. Sleep 120 seconds to allow the router(s) to boot up
4. Check current firmware version, and if there is an available upgrade
5. Update firmware
6. Reboot router to apply firmware upgrade

This playbook attempts to be smart and will not reboot a router if there is not an update available. Routers that have updates available will reboot twice. Once to apply the RouterOS version, and the second time to apply the firmware.

Prerequisites

You should already have an inventory file and the Ansible RouterOS collection installed. If not, check out the following post.

Setup Ansible and Mikrotik RouterOS

Playbook

Here is the playbook.
A quick command syntax note, RouterOS 7 and newer typically use slashes / between commands. i.e. /system/package/update/install. Older versions of RouterOS have spaces in the command path i.e. /system package update install Since this still works on newer versions, we use it here.

---
- name: Mikrotik RouterOS and Firmware Upgrades
  hosts: routers
  gather_facts: false
  tasks:

# Update RouterOS version.  Mikrotik update/install command automatically reboots the router
  - name: Check for RouterOS updates
    community.routeros.command:
      commands:
        - /system package update check-for-updates
    register: system_update_print

  - name: Update RouterOS version
    community.routeros.command:
      commands:
        - /system package update install
    when: system_update_print is not search('System is already up to date')

# Check if firmware needs an upgrade, upgrade and reboot.
  - name: Sleeping for 120 seconds.  Giving time for routers to reboot.
    ansible.builtin.wait_for:
      timeout: 120
    delegate_to: localhost
      
  - name: Check Current firmware
    community.routeros.command:
      commands:
        - ':put [/system routerboard get current-firmware]'
    register: firmware_current

  - name: Check Upgrade firmware 
    community.routeros.command:
      commands:
        - ':put [/system routerboard get upgrade-firmware]'
    register: firmware_upgrade

  - name: Upgrade firmware
    community.routeros.command:
      commands:
        - ':execute script="/system routerboard upgrade"'
    when: firmware_current != firmware_upgrade

  - name: Wait for firmware upgrade and then reboot
    community.routeros.command:
      commands:
        - /system routerboard print
    register: Reboot_Status
    until: "Reboot_Status is search(\"please reboot\")"
    notify:
      - Reboot Mikrotik
    retries: 3
    delay: 15
    when: firmware_current != firmware_upgrade

  handlers:
    - name : Reboot Mikrotik
      community.routeros.command:
        commands:
          - ':execute script="/system reboot"'

Run the playbook with

ansible-playbook -i routers.ini mikrotik_update.yaml

Change routers.ini to your router inventory.
mikrotik_update.yaml to whatever you end up calling the playbook.