Handling of char value

So you intend to call jswrap_ESP32_get_Char_Value when the ESP32 asks Espruino for the data inside a characteristic?

Rather than:

 jsvObjectIteratorNew(&serviceIt,services­Data);
    while(jsvObjectIteratorHasValue(&service­It)){
        serviceKey = jsvObjectIteratorGetKey(&serviceIt);
        if(jsvIsEqual(serviceKey,serviceUUID)){
         ...

You could just use:

serviceData = jsvSkipName(jsvFindChildFromVar(servicesData, serviceUUID, false));
if (serviceData) {

However one problem you have is UUIDs can be defined in different ways, eg 0xABCD, "ABCD", "AbCd" - so maybe what you're doing is better - but use bleVarToUUID and then compare the raw UUIDs, rather than using jsvIsEqual.

you do say the ESP32 uses handles though? IMO it would probably be faster/easier to have a separate list of handle vs. value in execInfo.hiddenRoot instead? It might come in handy in other places - for instance I think notifications so something like that already?