Collect contributions from the community

To keep track about what others have implemented.

Fixes

Fix crash when make_new within machuart.c is called with zero arguments. Implemented through 03a166e7 by @knagymate, see also https://github.com/pycom/pycom-micropython-sigfox/pull/401.
Fix wrong callback function in recv_queue_handler of ESP-Now. Implemented through d628cbc0 by @rodgergr, see also https://github.com/pycom/pycom-micropython-sigfox/pull/415.

Support for generic ESP32 boards. Implemented through https://github.com/robert-hh/pycom-micropython-sigfox/compare/9b02a11c^...8c7d64b2 by @robert-hh.
BerkeleyDB's btree implementation from Genuine MicroPython. Implemented through https://github.com/robert-hh/pycom-micropython-sigfox/compare/046f106^...b71ed3d0 by @robert-hh. See also btree – simple BTree database.
Ed25519 EdDSA signature scheme support. Implemented through https://github.com/ubirch/pycom-micropython-sigfox/compare/6851fbb^...8944639 by @ubirch / @thinkberg.
HTTP-client and -server implementation based on ESP-IDF components. Implemented through https://github.com/knagymate/pycom-micropython-sigfox/compare/2464e192%5E...HTTPS_Server by @geza-pycom and @knagymate.
List connected WiFi clients in AP mode. Implemented through 9a2c2eed by @agicquel.