What is maximum number of sending payload at AS923?

[Gusti Made Arya Wijaya]

Hello, I've tried to send sensor data using Lopy4 at AS923, I'm using Thethingstack network server and kerlink gateway. It can send maximum only 9 byte data at SF10, and then I check in lorawan airtime calculator (https://avbentem.github.io/airtime-calculator/ttn/as923/) the overhead size in lopy4 uplink is 15 byte.
.

I've tried to send 2 payload at SF7 for each 1 hour and it is successfully received in network server and application server. and then I tried to send 10 payloads with 60 second each payload. ,
but after that the uplink from mylopy is can't be received in network server until waiting 5 hours. what caused this issue to happen?

[Gusti Made Arya Wijaya]

@Gusti-Made-Arya-Wijaya I using downlink to trigger lopy4 to send payload data that saved in .txt file, here is the code

def new_req_log(self):
        try:
            print('fungsi new_req_log')

            downlink = self.dlink[2:]
            print(downlink)
            targetfile = downlink[:2]
            print(targetfile)
            targetmsg = downlink[2:]
            print(targetmsg)
            cari_tgl=(''.join(['{:02x}'.format(b) for b in targetfile]))
            print(cari_tgl)
            print('Request Log tanggal '+ cari_tgl)
            header = b"\xee" + targetfile[1:]

            print('selecting file')
            file_log = os.listdir('log')
            file_log.sort(reverse=True)

            c = 0
            targeted = 0
            for a in range(len(file_log)):

                c = c
                cari = file_log[a]
                target = cari[4:8]

                if target == cari_tgl:

                    targeted = c

                c = c + 1

            read_log_last = file_log[targeted]
            print(read_log_last)

            with open('log/' + read_log_last) as f:
                content = f.readlines()

            for n in range(len(targetmsg)):
                i = int.from_bytes(targetmsg[n:n+1], 'big')
                data = content[i].replace('FF04', 'FF05')  # log data id
                log_data = ubinascii.unhexlify(data.replace('\n', ''))  # convert string log to byte
                print(log_data)
                replaceHead = header + log_data[2:11]
                print(replaceHead)
                self.s.send(replaceHead)
                utime.sleep(60)
        except:
            print("downlink error")