Unhandled exception in callback handler

[AlganEren]

from machine import UART
import time
from network import Bluetooth
import adafruit_gps
import pycom
import _thread
def parse_and_broadcast():
    while True:    
        gps.update()
        
        if not gps.has_fix:
            print('Waiting for fix...')
            continue
        print('=' * 40)  # Print a separator line. 
        print('Latitude: {} degrees'.format(gps.latitude))
        print('Longitude: {} degrees'.format(gps.longitude))
        print('Fix quality: {}'.format(gps.fix_quality))  
        latitude = gps.latitude   
        longitude = gps.longitude 
        latlong = latitude + longitude
        print("latlong:",latlong)
        chr1.value(latlong)
        
            
            #if gps.satellites is not None:
                #print('# satellites: {}'.format(gps.satellites))
            #if gps.altitude_m is not None:
                #print('Altitude: {} meters'.format(gps.altitude_m))
            #if gps.track_angle_deg is not None:
                #print('Speed: {} knots'.format(gps.speed_knots))
            #if gps.track_angle_deg is not None:
                #print('Track angle: {} degrees'.format(gps.track_angle_deg))
            #if gps.horizontal_dilution is not None:
                #print('Horizontal dilution: {}'.format(gps.horizontal_dilution))
            #if gps.height_geoid is not None:
                #print('Height geo ID: {} meters'.format(gps.height_geoid))            
            

    
def conn_cb (bt_o):
    events = bt_o.events()
    if  events & Bluetooth.CLIENT_CONNECTED:
        print("Client connected")
    elif events & Bluetooth.CLIENT_DISCONNECTED:
        print("Client disconnected")


def char1_cb(chr,arg1=None):
    events = chr.events()
    if events &  Bluetooth.CHAR_READ_EVENT :
        parse_and_broadcast()
uart = UART(1, baudrate=115200, pins=('P8','P4'))    #tx rx 
gps = adafruit_gps.GPS(uart) 
print('Advertising Bluetooth...')
bluetooth = Bluetooth()
bluetooth.advertise(True)
bluetooth.set_advertisement(name='gps', service_uuid=b'1234567890abcdef') 
srv1 = bluetooth.service(uuid='0000000000000000', isprimary=True)
chr1 = srv1.characteristic(uuid='0000000000000002', properties=Bluetooth.PROP_INDICATE | Bluetooth.PROP_BROADCAST | Bluetooth.PROP_READ | Bluetooth.PROP_WRITE| Bluetooth.PROP_NOTIFY, value='InitialValue')
bluetooth.callback(trigger=Bluetooth.CLIENT_CONNECTED | Bluetooth.CLIENT_DISCONNECTED, handler=conn_cb)
chr1.callback(trigger=Bluetooth.CHAR_READ_EVENT | Bluetooth.CHAR_NOTIFY_EVENT, handler=char1_cb)

I am using fipy over pysense. I connected external gps. I am reading on uart. I parse. I broadcast the data over ble to the terminal application. after a while I get an error from ble as below

How can ı fix this error?
Do you have any ideas guys?
Can you help me?
Thank you!!

[AlganEren]

@jcaron How can I do what you say

[jcaron]

@AlganEren You can't write to the characteristic unless there is a client connected. You'll have to store the current connection state and only update the characteristic when you are connected.