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@user103949
Hi Robin,
Thanks for the pointers, I've looked at these two before.
The "GATT connection timeout" doesn't apply because as far as I can tell in that thread the connect() call initially succeeds but then quickly disconnects due to bonding issues. In my case I can't even get the initial connect() call to succeed.
I've also reviewed "BLE Communications" and tried various versions of BLE example code, including using the "ble_uart" module to see if my BLE sensor responds to the Nordic UART service (even-though the nRF app doesn't seem to need it), but no success.
At this point, connect() continues to fail most of the time with a timeout, and when it succeeds (rarely) it is not reproducible.
Best,
-- Terrence