Issues updating a fastl4 profile using Python SDK

I have a very small/simple fastl4 profile based on the default. I want to disable syn-cookie-enable, which is pretty easy from the CLI:

modify ltm profile cookie-all-fastl4 syn-cookie-enable disable

This results in the following:

ltm profile fastl4 cookie-all-fastl4 {

   app-service none

   defaults-from fastL4

syn-cookie-enable disabled

}

I have not had much success trying to do the same with the Python SDK.

If I use the load/update method it will create an entirely custom configuration.

cookie = bigip.tm.ltm.profile.fastl4s.fastl4.load(name='cookie-tcp-fastl4')

cookie.synCookieEnable='disabled'

cookie.update()

The result is this:

ltm profile fastl4 cookie-tcp-fastl4 {

   app-service none

   client-timeout 30

   defaults-from fastL4

   description none

   explicit-flow-migration disabled

   hardware-syn-cookie disabled

   idle-timeout 300

   ip-df-mode preserve

   ip-tos-to-client pass-through

   ip-tos-to-server pass-through

   ip-ttl-mode decrement

   ip-ttl-v4 255

   ip-ttl-v6 64

   keep-alive-interval disabled

   late-binding disabled

   link-qos-to-client pass-through

   link-qos-to-server pass-through

   loose-close disabled

   loose-initialization disabled

   mss-override 0

   other-pva-clientpkts-threshold 2

   other-pva-offload-direction bidirectional

   other-pva-serverpkts-threshold 1

   other-pva-whento-offload after-packets-per-direction

   priority-to-client pass-through

   priority-to-server pass-through

   pva-acceleration full

   pva-dynamic-client-packets 1

   pva-dynamic-server-packets 0

   pva-flow-aging enabled

   pva-flow-evict enabled

   pva-offload-dynamic enabled

   pva-offload-dynamic-priority disabled

   pva-offload-initial-priority medium

   pva-offload-state embryonic

   reassemble-fragments disabled

   receive-window-size 0

   reset-on-timeout enabled

   rtt-from-client disabled

   rtt-from-server disabled

   server-sack disabled

   server-timestamp disabled

   software-syn-cookie disabled

   syn-cookie-enable disabled

   syn-cookie-mss 0

   syn-cookie-whitelist disabled

   tcp-close-timeout 5

   tcp-generate-isn disabled

   tcp-handshake-timeout 5

   tcp-pva-offload-direction bidirectional

   tcp-pva-whento-offload embryonic

   tcp-strip-sack disabled

   tcp-time-wait-timeout 0

   tcp-timestamp-mode preserve

   tcp-wscale-mode preserve

   timeout-recovery disconnect

}

This is undesirable because now I have to manage changes in both the default fastl4 profile and this cookie profile as well.

If I try to use the modify method I get an error:

cookie=bigip.tm.ltm.profile.fastl4s.fastl4.modify(name='cookie-tcp-fastl4', synCookieEnable='disabled')

 File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/f5/bigip/resource.py", line 411, in modify

   self._modify(**patch)

 File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/f5/bigip/resource.py", line 392, in _modify

   self._prepare_put_or_patch(patch)

 File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/f5/bigip/resource.py", line 425, in _prepare_put_or_patch

   update_uri = self._meta_data['uri']

KeyError: 'uri'

I'm not sure why the syntax is wrong, I use a very similar syntax for all sorts of other Resources.