A sketch that includes BTstackLib on a CYW43 board fails with arduino-pico's
static_assert: "This library needs Bluetooth enabled. Use the 'Tools->IP/
Bluetooth Stack' menu in the IDE to enable it." There is no such menu here, so
it reads as a setting we forgot to expose. What is actually true is simpler:
the CYW43439's Bluetooth controller is not emulated — only its WiFi side is —
so there is nothing to switch on.
Appends that, leaving the compiler's own diagnostic intact above it because the
developer still needs the real text. Deliberately a separate helper from
humanize_cli_error, which REPLACES arduino-cli's own failures; this one only
adds context under a compiler message.
Worth knowing for whoever picks up the BT work: this is the honest-failure
milestone. Making a BT sketch compile at all means flipping this board's FQBN
to ipbtstack=ipv4btcble, which swaps liblwip.a for liblwip-bt.a and costs every
sketch on the board ~71 KB flash and ~18 KB RAM — and leaves it reaching
HCI_STATE_WORKING while advertising to nobody. The mechanism is mapped in
project/pimoroni-pico-plus-2w/STATUS.md.
David Montero Crespo