handle firmware downgrade

roles/firmware/tasks/install.yml

@@ -0,0 +1,23 @@
+# check the timestamps, might want to preserve the old ones
+- name: Backup OS provided Firmware
+  copy:
+    src: "/lib/firmware/brcm/{{ item }}"
+    dest: "/lib/firmware/brcm/{{ item }}.orig"
+  with_items:
+    - brcmfmac43430-sdio.bin
+    - brcmfmac43455-sdio.bin
+
+# grab the old firmware
+- name: Retrieve older firmware
+  get_url:
+    url: "{{ item.url }}"
+    dest: "{{ item.dest }}"
+  with_items:
+    - { url: 'http://download.iiab.io/packages/brcmfmac43430-sdio.bin_2020-02-16_7.45.98.97' dest:/lib/firmware/brcm/brcmfmac43430-sdio.bin_iiab } 
+    - { url: 'http://download.iiab.io/packages/brcmfmac43455-sdio.bin_2015-03-01_7.45.18.0_ub19.10.1' dest: '/lib/firmware/brcm/brcmfmac43455-sdio.bin_iiab' } 
+
+- name: "Add 'firmware_retrieved: True' to {{ iiab_state_file }}"
+  lineinfile:
+    path: "{{ iiab_state_file }}"    # /etc/iiab/iiab_state.yml
+    regexp: '^RPi_firmware_retrieved'
+    line: 'RPi_firmware_retrieved: True'

roles/firmware/tasks/main.yml

@@ -0,0 +1,20 @@
+- name: Include older RPi Firmware
+  include_tasks: install.yml
+  when: RPi_firmware_retrieved is undefined
+
+- name: Install check-firmware service files
+  template:
+    src: "{{ item.src }}"
+    dest: "{{ item.dest }}"
+    mode: "{{ item.mode }}"
+  with_items:
+    - { src: 'fw-warn.sh', dest: '/usr/sbin/' mode: '0644' }
+    - { src: 'check-firmware.service', dest: '/etc/systemd/system/' mode: '0644'}
+    - { src: 'check-firmware.sh', dest: '/usr/sbin/' mode: '0755' }
+
+- name: Enable and Start check-firmware.service
+  systemd:
+    name: check-firmware.service
+    state: reloaded    
+    enabled: yes
+    status: started