Program running on RPi 3b+ Very Strange Behavior - Out of Bound Index

[deanhystad]

Maybe your writes/notify fails. If you only get one data back, the info array is only 4 long, and info[4] is out of range.

Why aren't you saving your data in your delegate? Something like this:

class MyDelegate(DefaultDelegate):
    def __init__(self):
        super().__init__()
        self.dd03_updates = 0
        self.dd04_updates = 0
        # If you need data as a dictionary, may as well save it as a dictionary.
        self.data = {
            "volts": None,
            "amps": None,
            "capacity": None,
            "remain": None,
            "cell1": None,
            "cell2": None,
            "cell3": None,
            "cell4": None,
        }
 
    def handleNotification(self, cHandle, data):
        hex_data = binascii.hexlify(data)
        if b'dd04' in hex_data:
            self.dd04_messages += 1
            self.data.update(zip(
                ("volts", "amps", "capacity", "remain"),
                struct.unpack_from('>HHHH', data, 4)
            ))
        elif b'dd03' in hex_data:
            self.dd03_messages += 1
            self.data.update(zip(
                ("cell1", "cell2", "cell3", "cell4"),
                struct.unpack_from('>HHHH', data, 4)
            ))
 
    def __str__(self):
        return "\n\t".join((
            f'Messages  dd03:{self.dd03_messages}, dd04{self.dd04_messages}',
            *[f'{key:10} = {value}' for key, value in self.data.items()]
        ))
 
delegate = MyDelegate()
bms.setDelegate(delegate)  # setup bt delegate for notifications
 
. . .

while True:
    bms.writeCharacteristic(0x15, b'\xdd\xa5\x03\x00\xff\xfd\x77', False)
    bms.waitForNotifications(5)
    bms.writeCharacteristic(0x15, b'\xdd\xa5\x04\x00\xff\xfc\x77', False)
    bms.waitForNotifications(5)
    print(delegate)


    ret = mqtt.publish(topic, payload=json.dumps(delegate.data), qos=0, retain=False)