Wirepas HAT not working on Raspberry Pi 4 (sink cannot communicate via serial port)

[alexdebiasio]

Hi,
I'm trying to setup a Wirepas gateway on a raspberry pi 4, (following this guide: guide.
I've bought a Wirepas HAT from the official promistel store but It looks like the sink service is not able to communicate with the Wirepas HAT.
If I try to launch the sinkService binary found inside the Docker image and copied outside, I get the following: (tried with all the three baudrate suggested combinations, same result)

./sinkService -p /dev/ttyAMA0 
2022-01-11 16:52:02,116 | [INFO] Main:Starting Sink service:
        -Port is /dev/ttyAMA0
        -Baudrate is 0
        -Dbus Service name is com.wirepas.sink.sink0
2022-01-11 16:52:02,116 | [INFO] Main:Auto baudrate: testing 125000 bps
2022-01-11 16:52:02,117 | [DEBUG] SERIAL:Custom bitrate set: 125000
2022-01-11 16:52:02,117 | [INFO] wpc_int:WPC initialized
2022-01-11 16:52:02,618 | [WARNING] SLIP:Timeout to receive frame (size=0)
2022-01-11 16:52:02,618 | [ERROR] wpc_int:Didn't receive answer to the request 0x04
2022-01-11 16:52:02,618 | [ERROR] wpc_int:Unable to poll for request
2022-01-11 16:52:03,119 | [WARNING] SLIP:Timeout to receive frame (size=0)
2022-01-11 16:52:03,119 | [ERROR] wpc_int:Didn't receive answer to the request 0x0e
2022-01-11 16:52:03,119 | [WARNING] linux_plat:Exiting dispatch thread
2022-01-11 16:52:03,619 | [WARNING] SLIP:Timeout to receive frame (size=0)
2022-01-11 16:52:03,619 | [ERROR] wpc_int:Didn't receive answer to the request 0x04
2022-01-11 16:52:03,619 | [ERROR] wpc_int:Unable to poll for request
2022-01-11 16:52:03,619 | [WARNING] linux_plat:Exiting polling thread
2022-01-11 16:52:03,619 | [INFO] Main:Auto baudrate: testing 115200 bps
2022-01-11 16:52:03,620 | [DEBUG] SERIAL:Custom bitrate set: 115200
2022-01-11 16:52:03,620 | [INFO] wpc_int:WPC initialized
2022-01-11 16:52:04,120 | [WARNING] SLIP:Timeout to receive frame (size=0)
2022-01-11 16:52:04,120 | [ERROR] wpc_int:Didn't receive answer to the request 0x0e
2022-01-11 16:52:04,121 | [WARNING] linux_plat:Exiting dispatch thread
2022-01-11 16:52:04,621 | [WARNING] SLIP:Timeout to receive frame (size=0)
2022-01-11 16:52:04,621 | [ERROR] wpc_int:Didn't receive answer to the request 0x04
2022-01-11 16:52:04,621 | [ERROR] wpc_int:Unable to poll for request
2022-01-11 16:52:04,621 | [WARNING] linux_plat:Exiting polling thread
2022-01-11 16:52:04,622 | [INFO] Main:Auto baudrate: testing 1000000 bps
2022-01-11 16:52:04,622 | [DEBUG] SERIAL:Custom bitrate set: 1000000
2022-01-11 16:52:04,622 | [INFO] wpc_int:WPC initialized
2022-01-11 16:52:05,123 | [WARNING] SLIP:Timeout to receive frame (size=0)
2022-01-11 16:52:05,123 | [ERROR] wpc_int:Didn't receive answer to the request 0x04
2022-01-11 16:52:05,123 | [ERROR] wpc_int:Unable to poll for request
2022-01-11 16:52:05,624 | [WARNING] SLIP:Timeout to receive frame (size=0)
2022-01-11 16:52:05,624 | [ERROR] wpc_int:Didn't receive answer to the request 0x0e
2022-01-11 16:52:05,624 | [WARNING] linux_plat:Exiting dispatch thread
2022-01-11 16:52:06,124 | [WARNING] SLIP:Timeout to receive frame (size=0)
2022-01-11 16:52:06,124 | [ERROR] wpc_int:Didn't receive answer to the request 0x04
2022-01-11 16:52:06,124 | [ERROR] wpc_int:Unable to poll for request
2022-01-11 16:52:06,124 | [WARNING] linux_plat:Exiting polling thread
2022-01-11 16:52:06,125 | [ERROR] Main:Cannot establish communication with sink with different tested baudrate

Here's the relevant gateway.env configuration I've used:

GATEWAY_TAG=latest
 
WM_GW_ID=wirepas_test

WM_GW_SINK_UART_PORT=/dev/ttyAMA0

WM_GW_SINK_BITRATE=125000

If I populate a sink.env file inside the boot partition, I noticed that the file is correctly renamed to sink.success

I followed the tutorial a couple of time (also the deprecated one, for version 1.2) but without success. I didn't found any further instructions on how to debug this situation, could someone help me?

Thank you
Alex