tests: Disable UART in PPK tests

Disable UART in PPK tests

Signed-off-by: Simen S. Røstad <simen.rostad@nordicsemi.no>

Author: simensrostad

tests/on_target/tests/test_ppk/test_power.py

@@ -175,6 +175,10 @@ def test_power(thingy91x_ppk2, hex_file):
     except AssertionError:
         pytest.skip("Device unable to connect to cloud, skip ppk test")
 
+    # Disable UART on the device
+    thingy91x_ppk2.t91x_uart.write("pm suspend uartuart@9000\r\n")
+    thingy91x_ppk2.t91x_uart.write("pm suspend uartuart@8000\r\n")
+
     thingy91x_ppk2.ppk2_dev.start_measuring()
 
     start = time.time()