test: ipc: Test from samples/subsys/ipc/rpmsg_service fails on nrf5340dk_nrf5340_cpuapp

[PerMac]

Describe the bug
The test from the title fails on nrf53_cpuapp. The sample is started and hangs after printing:
DEVICE: RPMsg Service [master] demo started

To Reproduce
Steps to reproduce the behavior:

1. Have nrf5340dk connected
2. call /scripts/twister --device-testing -T samples/subsys/ipc/rpmsg_service/ -p nrf5340dk_nrf5340_cpuapp --device-serial /dev/ttyACM2 -v -v
3. See error

Expected behavior
The test passes

Impact
Not clear

Logs and console output

DEBUG   - DEVICE: *** Booting Zephyr OS build v2.5.0-rc1-16-g085d2eda8d2b  ***
DEBUG   - DEVICE: Starting application thread!
DEBUG   - DEVICE: 
DEBUG   - DEVICE: RPMsg Service [master] demo started

and then hangs

Environment (please complete the following information):

• OS: Ubuntu 18.04
• Toolchain Zephyr SDK
• Commit SHA or Version used: v2.5.0-rc1-16-g085d2eda8d2b

[ioannisg]

will take a look

[ioannisg]

@PerMac I am not sure this is a bug. For the sample to work one needs to flash the two cores (master and remote), I guess, separately. West build takes care of building both executables, but the images needs to be flashed individually.

[KeremSAR]

I have the same issue, It hangs there for both remote and master application.
while (!rpmsg_service_endpoint_is_bound(ep_id)) { k_sleep(K_MSEC(1)); }
I flashed the images individually for nrf5340 cores. What could be the issue ?

[pauleffect90]

Same issue. @KeremSAR. Did you manage to fix it?