HI @hartkopp , thanks for looking at this! The devices use a legacy custom bootloader implementation that have custom flow control messages around the ISOTP block that also specifies the flash page. It was developed without support for the ISOTP flow control message. I did find a work around using the kvaser interface and recieve_own_messages param in the meantime. This would probably not work for all interfaces.

bus = KvaserBus(channel=0, bitrate=250000, accept_virtual = True, receive_own_messages = True) #recv_own_msgs allows dummy msg below to work
nodes = isotp.Address(isotp.AddressingMode.Normal_29bits, rxid=PDU1_ID(5,PGN,TX_NODE,RX_NODE), txid=PDU1_ID(5,PGN,RX_NODE,TX_NODE))
params = {
		'stmin' : 1,
		'blocksize' : 0,
		'tx_data_length' : 8,
		'tx_data_min_length' : 8,
		'squash_stmin_requirement' : False,
		'rx_flowcontrol_timeout'  : 1000,
		'rx_consecutive_frame_timeout' : 1000,
		'tx_padding' : 0xFF,
		'wftmax' : 0,
		'listen_mode' : True
}
stack = isotp.CanStack(bus, address=nodes, error_handler=my_error_handler,  params = params)
#Custom flow control to specify flash page
stack.send(pagedata)
stack.process() # send first frame
bus.send(can.Message(arbitration_id=PDU1_ID(5,PGN,TX_NODE,RX_NODE), data = [0x30,0x00,0x01,0x00], is_extended_id=True)) #Dummy msg to continue w/o flow control with 1ms spacing
while stack.transmitting():
   stack.process()
   time.sleep(stack.sleep_time())
#Custom flow control to signal end of flash page transmission

Uh oh!

Add param to ignore flow control on transmit #67

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