I'm using an ESP32 with hci_uart firmware sample found in IDF. This ESP32 is a Bluetooth co-processor attached to my old RPi1.
On the Pi, I'm using this command to bring up the hci0 interface:
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/usr/bin/hciattach -s 921600 /dev/ttyBT any 921600 flow
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# l2ping my_notebooks_mac
...
...
CTRLC: 3 sent, 3 received, 0% loos
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# l2ping my_smartphone
Can't connect: Operation now in progress
Can you recommend me any way to debug or troubleshoot this problem? (I have access to the Debug port of ESP32 during this operation - if this matters for debug)
Thank you very much.