[Python] Python - isoTP lib cannot sending consecutive frame after get flow control frame

as you see on the title I'm using python 3.13.1 with can-isotp2.0.6 and python-can 4.5.0 and USB-CAN Robotell for hardware my scrip

def send_msg(data)
channel = find_Robotell_port()
paramsdata = load_setup ("setup.json")
bus = can.interface.Bus(interface='robotell', channel=channel, bitrate=500000)
data_byte = bytes([int(x,16) for x in data])
addr = isotp.Address(isotp.AddressingMode.Normal_11bits, rxid=0x62C, txid=0x6AC)
params = paramsdata["Parameters"]
stack = isotp.CanStack(bus, address=addr, error_handler=my_error_handler, params=params)

try:
stack.start()
stack.send(data = data_byte, send_timeout= 5)
except isotp.BlockingSendFailure:
Print('failure to send')
finally:
stack.stop()
bus.shutdown()


and here is params:

"Parameters": {
"stmin" : 10,
"blocksize" : 0,
"tx_data_length" : 8,
"tx_data_min_length" : 8,
"override_receiver_stmin" :1000,
"rx_flowcontrol_timeout" : 10000,
"rx_consecutive_frame_timeout" : 1000,
"tx_padding": 255,
"wftmax" : 0,
"max_frame_size" : 4095,
"can_fd" : false,
"bitrate_switch" : false,
"default_target_address_type": 0,
"rate_limit_enable" : false,
"rate_limit_max_bitrate" : 10000000,
"rate_limit_window_size" : 0.2,
"listen_mode" : false,
"blocking_send" :true,
"logger_name" : "CAN_TP"


it working fine with payload under 8byte (single frame) but have problem when payload over 8byte: after sending the first frame and recv the flow control. tester doesn't send any consecutive frame and raise exception: BlockingSendFailure

For example: i tried with data: input = ['0x67','0x03','0xec', '0x45', '0xf2', '0x63', '0xd0', '0xd8', '0xae', '0x9d', '0x2d', '0xb3', '0x23', '0x0', '0x30', '0x73', '0xc0', '0x89','0x73', '0xc0', '0x89']

send : 10 15 67 03 EC 45 F2 63 (first frame)
recv : 30 08 14 00 00 00 00 00 (flow control)
send : nothing and raise exception


so is there any idea for me to fix this problem Thanks

fix the problem, maybe wrong setup for isotp

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