How to "return" result from _IRQ_SCAN_RESULT

[PM-TPI]

How do i retrieve the "return rssiValue" without using a global variable ????

Code: Select all

import ubluetooth
from micropython import const

IRQ_SCAN_RESULT = const(1 << 4)
IRQ_SCAN_COMPLETE = const(1 << 5)
bt = ubluetooth.BLE()
bt.active(True)

def bt_irq(event, data):
    if event == _IRQ_SCAN_RESULT:
        addr_type, addr, connectabt, rssi, adv_data = data
        if adv_data[2:11] == b'ble-name':
           rssiValue = rssi
           return rssiValue	
       
    elif event == _IRQ_SCAN_COMPLETE:
        print("scan complete")
 
bt.gap_scan(9_000, 30_000, 30_000)
bt.irq(bt_irq)
 
# retrieve the "return rssiValue" value ???? 	

[jimmo]

Hi,

The scan method runs asynchronously. So there's nothing to "return" to.

Here are a couple of options:

1. Set it in a global variable, then wait for the global variable to be set:

Code: Select all

rssiValue = None

def bt_irq(event, data):
    global rssiValue
    ..code to handle scan result...
      rssiValue = rssi
      
       
bt.irq(bt_irq)
bt.gap_scan(9_000, 30_000, 30_000)

while rssiValue is None:
  time.sleep_ms(100)
  
# or just sleep_ms(9000) to wait for the scan to complete

2. Set it in a global variable, and wait for the scan complete event.

You might find the example in https://github.com/micropython/micropython/pull/5343 (ble_temperature_central.py) useful for an example of this.

3. Do whatever you need to do with the rssi as soon as you get the scan result.

If you can provide more info about what your program is doing then I can give a better example.

Also, I notice you're using adv_data[2:11] to extract the advertising name. See also in that PR for some code that does this in a more generic way. I hope that PR gets merged this week.

[PM-TPI]

Would using schedule in "elif event == _IRQ_SCAN_DONE:" be an acceptable method to pass data...

Code: Select all

rssiValue = None
def bt_irq(event, data):
    global rssiValue
    if event == _IRQ_SCAN_RESULT:
	rssiValue = rssi
    elif event == _IRQ_SCAN_DONE:
        schedule(func, rssiValue)