Quectel UG9x function connect not found

Did you paste it into the left-hand side of the IDE? The module is there: https://www.espruino.com/modules/

https://www.espruino.com/Modules#working­-with-modules

The left-hand side of the IDE is a direct connection to the board itself, which the IDE does not interfere with. As such, if you type require("modulename") in the left-hand side then the IDE will not have a chance to dynamically load the module for you, so if it's not in Espruino you won't be able to use it. To fix that, just add require("modulename") to the right-hand side of the IDE (nothing else is required) and click Send to Espruino - the IDE will then upload that module and you'll be able to use it from the left-hand side.