Tweak flaky test

ports/zephyr-cp/tests/bsim/conftest.py

@@ -97,15 +97,16 @@ def bsim_phy(request, bsim_phy_binary, native_sim_env, sim_id):
         sample_device_id = int(sample_marker.kwargs.get("device_id", 1))
         devices = max(devices, sample_device_id + 1)
 
-    sim_length_us = int(duration * 1e6)
+    # Do not pass -sim_length: if the PHY exits on simulated time, device 0 can
+    # still be flushing UART output and test output can get truncated. Instead,
+    # let pytest own process lifetime and terminate the PHY at fixture teardown.
     cmd = [
         "stdbuf",
         "-oL",
         str(bsim_phy_binary),
         "-v=9",  # Cleaning up level is on 9. Connecting is 7.
         f"-s={sim_id}",
         f"-D={devices}",
-        f"-sim_length={sim_length_us}",
     ]
     print("Running:", " ".join(cmd))
     proc = subprocess.Popen(

ports/zephyr-cp/zephyr-config/west.yml

@@ -4,7 +4,7 @@ manifest:
   projects:
     - name: nrf_hw_models
       url: https://github.com/tannewt/ext_nRF_hw_models
-      revision: 24de78c485dce1a6048f8ae1c69a8d70c93b8cdd
+      revision: bb351cef9e5ab4d175fe3cb7c4d6761d837bac20
       path: modules/bsim_hw_models/nrf_hw_models
     - name: zephyr
       url: https://github.com/adafruit/zephyr