Maqueen UART via Bluetooth Low Energy

Hi,
I am developing an app using MIT App Inventor (the Scratch like language you can use to create Android apps developed at MIT) to control the Maqueen Robot. And I am planning to show it next week at MIT at the App Inventor summit. My proof of concept works fine. The phone communicates with the micro:bit using UART over Bluetooth (BLE) and the Makecode extension https://github.com/DFRobot/pxt-maqueen is used to let the Maqueen move.
But: I would like to do more! Like line following and obstacle avoidance. Whenever I try to add something more, there is an error message on the micro:bit: 020 - sad smiley. As far as I could find, this means that there is a storage problem.

I found in the micro:bit documentation that the Bluetooth service in the micro:bit requires a lot of storage and that you should remove what you do not need, like the infrared service. So this is my first question: would there be a possibility to have a version of the Maqueen extension without the infrared support?
Further, I have been reading this post: viewtopic.php?f=12&t=16884&p=29628&hili ... art#p29628 where there is mention of a (storage) problem with the ultra sensor for obstacle avoidance. My second question, is there indeed a problem with the obstacle avoidance that could crash the micro:bit?
Cheers, Ghica.

I show the code I used below and to be practical I show the JavaScript version:

function mqGoBck () {
maqueen.MotorRun(maqueen.aMotors.M1, maqueen.Dir.CCW, mqSpeed)
maqueen.MotorRun(maqueen.aMotors.M2, maqueen.Dir.CCW, mqSpeed)
}
function moveMaQueen () {
if (mqCommand == "Fwd") {
mqGoFwd()
} else if (mqCommand == "Bck") {
mqGoBck()
} else if (mqCommand == "Rgt") {
mqGoRgt()
} else if (mqCommand == "Lft") {
mqGoLft()
} else if (mqCommand == "Stp") {
mqStop()
} else {
basic.showString(uaInput)
basic.showString("" + mqSpeed)
}
}
bluetooth.onUartDataReceived(serial.delimiters(Delimiters.Fullstop), function () {
uaInput = bluetooth.uartReadUntil(serial.delimiters(Delimiters.Fullstop))
mqCommand = uaInput.substr(0, 3)
mqSpeed = parseFloat(uaInput.substr(3, 3))
bluetooth.uartWriteNumber(mqSpeed)
moveMaQueen()
})
function mqGoFwd () {
maqueen.MotorRun(maqueen.aMotors.M1, maqueen.Dir.CW, mqSpeed)
maqueen.MotorRun(maqueen.aMotors.M2, maqueen.Dir.CW, mqSpeed)
}
bluetooth.onBluetoothDisconnected(function () {
maqueen.motorStopAll()
basic.showString("D")
})
function mqGoRgt () {
maqueen.MotorRun(maqueen.aMotors.M1, maqueen.Dir.CW, 50)
maqueen.MotorRun(maqueen.aMotors.M2, maqueen.Dir.CW, 0)
}
bluetooth.onBluetoothConnected(function () {
basic.showIcon(IconNames.Happy)
})
function mqGoLft () {
maqueen.MotorRun(maqueen.aMotors.M2, maqueen.Dir.CW, 50)
maqueen.MotorRun(maqueen.aMotors.M1, maqueen.Dir.CW, 0)
}
function mqStop () {
maqueen.motorStopAll()
}
let uaInput = ""
let mqCommand = ""
let mqSpeed = 0
basic.showString("MQ 8")
bluetooth.startUartService()