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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@fanoush
There are many types of radios that differ both in frequencies and protocols. BLE radio in Bangle can do only 2.4GHz and the hardware can send only limited types of packets for similar protocols, you can't do e.g. wi-fi over it even if it is 2.4GHz too. Nordic SDK says "Supported protocols - The nRF52 Series multiprotocol radio supports Bluetooth Low Energy, proprietary (including Enhanced ShockBurst and Gazell), ANT, Thread, Zigbee, and 802.15. 4.".
Your old car key may quite likely use different frequency like 433/868/915 MHz. If it uses 2.4GHz then there is some chance the hardware could do it but it would be a lot of work to figure out details.