test: CircularBuffer: Don't push zero elements ...

The CircularBuffer doesn't allow pushing zero elements; you must push at
least one. Update the CircularBuffer unit test to avoid invalid use of
the CircularBuffer.

test: lorawanstack: Use valid message type ...

We previously made up an invalid message type, which was roughly
`MCPS_MULTICAST | 0x40`. This causes an MBED_ASSERT failure in the
handle_rx function, as it uses an assert to validate the message type
passed to it (in convert_to_msg_flag()). Use the valid message type
MCPS_MULTICAST instead in the handle_rx unit test.

unittests: Test_LoRaWANTimer.start: Fix test failure ...

We weren't initialising the mocks correctly, so an MBED_ASSERT failed in
`LoRaWANTimer::start` because the "timer_id" was not set.

equeue: Enable use of stub from C++ ...

Add extern "C" to the equeue_stub declaration to avoid an error when a C
file implements the equeue_stub symbol (as we do in equeue_stub.c).

    Undefined symbols for architecture x86_64:
      "_equeue_stub", referenced from:
          Test_LoRaWANTimer_start_Test::TestBody() in Test_LoRaWANTimer.cpp.o
    ld: symbol(s) not found for architecture x86_64
    clang: error: linker command failed with exit code 1 (use -v to see invocation)

cmake: Avoid linking to gcov ...

Use the `--coverage` option instead of manually linking to gcov, as some
host platforms (like macOS, FreeBSD) don't have gcov by default and use
an llvm equivalent instead.

equeue: Add missing header guards ...

The header equeue_stub.h was missing header guards to enforce single
inclusion. Add some header guards.

cmake: Remove trailing whitespace ...

Remove trailing whitespace from lorawantimer's CMakeLists.txt.

Merge pull request #14939 from jeromecoutant/PR_PIN_ALIAS ...

Standard Pin Names validation script update

pinvalidate.py script: add deprecated ARDUINO test

pinvalidate.py script: add SPI and I2C alias check ...

Goal is to follow
hal/include/hal/PinNameAliases.h

pinvalidate.py script: remove spaces

Merge pull request #14940 from Patater/update-prettytable ...

python: Allow newer prettytable with newer python

python: Allow newer prettytable with newer python ...

This helps to allow installation of Mbed OS's Python requirements, when
CMake is used, into the same Python environment as mbed-os-tools. The
versions specified here are aligned with mbed-os-tools;
tools/cmake/requirements.txt depends on the same version of prettytable
as mbed-os-tools's requirements.txt.

python: Remove direct dependency on prettytable ...

Mbed CLI 1 parses the base requirements.txt and attempts to
automatically install missing python libraries for you. Unfortunately,
it's requirements parser is not as capable as the one shipping with pip.
In particular, we are unable to express different version of libraries
conditional on the version of Python being used.

    ---
    [mbed] ERROR: Unknown Error: Unsupported environment marker:  python_version < '3.6'

Remove the direct dependency on prettytable from requirements.txt, as
mbed-os-tools depends on prettytable and we can pick up the dependency
(as properly expressed conditionally on the Python version) from there,
without having to use the limited requirements parser in Mbed CLI 1.

Merge pull request #14730 from Ekidna/fix/sx126x-select-pins ...

Add config macros for device-variant, freq-support and xtal config

Merge pull request #14912 from ARMmbed/move_unittest_ble_headers_lib ...

Move ble stubs to FEATURE_BLE lib

Merge pull request #14932 from ARMmbed/remove_tools_host_tests ...

Remove host_tests from mbed-os/tools

CMake: Limit the mbed-fakes-ble to required dependency mock

CMake: Move ble fakes into FEATURE_BLE double dir ...

Previously ble fakes as part of UNITTESTS/fakes, this PR moves
ble fakes to FEATURE_BLE double directory to make ble stubs
to be self-contained.

CMake: fakes ble: Remove trailing whitespace

Remove mbed-headers-connectivity ...

Moved all the headers out of mbed-headers-connectivity, and these changes remove
that headers lib reference from lorawan and cellular unit tests

CMake: Create mbed-headers-ble library ...

Previously ble headers are part of mbed-headers-connectivity, this PR
moves ble headers into new mbed-headers-ble to make ble stubs to be
more self-contained and improves the composition of the library.

Merge pull request #14880 from Patater/dont-require-icetea ...

Dont require icetea

Merge pull request #14920 from hazzlim/refactor-connectivity-netsocket-unittests ...

Refactor connectivity netsocket unittests

Remove host_tests from mbed-os/tools ...

host tests (mbedhtrun) is maintained as part of mbed-os-tools but there
is a redundant duplicate of host_tests under mbed-os/tools/ directory
this PR changes to remove those duplicates and update test_api py modules
to use host tests from mbed-host-tests

Merge pull request #14924 from ARMmbed/refactor_cellular_unittest ...

Refactor cellular unittest CMake

Merge pull request #14927 from paul-szczepanek-arm/master ...

add workflow for checking ble feature selection compilation

Merge pull request #14922 from ARMmbed/at-handler-fix ...

Cellular: AT command fix - hex string shouldn't be quoted on bc95

Merge pull request #14921 from paul-szczepanek-arm/fix-ble-default-db ...

BLE: suppress error when no path is passed in for ble security db

Merge pull request #14919 from paul-szczepanek-arm/fix-feature-toggle ...

BLE: fix missing define guards for feature selection