Uploading 2 Mb file in transparent mode with BG95

IoT Modules LPWA Module
1

Hi,
I am trying to upload a large 2 MB file with the BG95 modem, which failed due to ERROR 503 Service Unavailable. The issue seems to be the communication timeout, It looks like the modem opens a socket and doesn’t transmit any data for some time. What happens inside the modem after the “CONNECT” message? Does the modem need time to encrypt the file?

2

Hi,
Modem won’t encrypt the data that need to transimit. Are you using TCP for data transimission? It is better to provide whole log.

3

Hi Rodney,
Thank you for your response. Yes, I use TCP for transmission.
Below is the log I have recorded:

AT+QIOPEN=1,0,“TCP”,“www.xxxxx.com”,80,0,2
CONNECT

POST /uploadlog/1235 HTTP/1.1
Host: www.xxxxx.com
Content-Type: application/x-www-form-urlencoded
Content-Length: 305718

battery=%5B%7B%27timestamp%27%3A+1743025552.240812%2C+%27plc_battery_level%27%3A+2561%2C+%27hmi_battery_status%27%3A+%27OK%27%2C+%27plc_battery_status%27%3A+%27OK%27%7D%2C+%7B%27timestamp%27%3A+1743025815.551933%2C+%27plc_battery_level%27%3A+2563%2C+%27hmi_battery_status%27%3A+%27OK%27%2C+%27plc_battery_status%27%3A+%27OK%27%7D%2C+%7B%27timestamp%27%3A+1743027770…
more data…
…

HTTP/1.1 503 Service Unavailable
Connection: keep-alive
Server: Cowboy
Date: Thu, 27 Mar 2025 20:28:44 GMT
Content-Length: 506
Report-To: {“group”:“xxxxx”,“max_age”:3600,“endpoints”:[{“url”:“xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx”}]}
Reporting-Endpoints: heroku-nel=https://xxxxx.com/reports?ts=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Nel: {“report_to”:“xxxxx”,“max_age”:3600,“success_fraction”:0.005,“failure_fraction”:0.05,“response_headers”:[“Via”]}
Content-Type: text/html; charset=utf-8
Cache-Control: no-cache, no-store

<html>
  <head>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<meta charset="utf-8">
	<title>Application Error</title>
	<style media="screen">
	  html,body,iframe {
		margin: 0;
		padding: 0;
	  }
	  html,body {
		height: 100%;
		overflow: hidden;
	  }
	  iframe {
		width: 100%;
		height: 100%;
		border: 0;
	  }
	</style>
  </head>
  <body>
	<iframe src="//www.xxxxx.com/error-pages/application-error.html"></iframe>
  </body>
</html>

NO CARRIER

AT+QICLOSE=0
OK

4

You should use AT+QISEND to send data. You also should make sure the connection is created correctly before applicaiton try to send data.
But If you try to run a http application. Why do not you use http command directly? BG95 supports http protocol.

5

Hi Ridney, I send data in streaming mode with AT+QIOPEN=1,0,“TCP”,“www.xxxxx.com”,80,0,2
Do I need to use AT+QISEND in this case?
What is the difference between TCP and HTTP when the data is sent?

6

Of course you should use AT+QISEND to send data. AT+QIOPEN is just usded to create a socket connection.
If you use TCP command sets. Your application must process http protocol related task. Please refer to our guide document.

7

I think I am correct according to section 3.3. TCP Client Works in Transparent Access Mode in the document below:
Quectel_LTE_Standard_TCP(IP)_Application_Note_V1.1.pdf (445.1 KB)

8

Sorry, I though you were using buffer mode to send data. It is ok with transparent mode.
Because you try to send a lot of data. It takes long time to send over UART. Have you set any low power mode so that modem goes into deactivated mode? Please check.

9

Here is the device configuration:
AT&V
&C: 1
&D: 2
&F: 0
&W: 0
Q: 0
V: 1
X: 4
Z: 0
E: 1
S0: 0
S4: 10
S5: 8
S6: 2
S7: 0
S8: 2
S10: 15
S3: 13
OK

10

Please check device status while it returns NO CARRIER.
AT+CGREG?
AT+COPS?
AT+CSQ
AT+CGACT?
AT+QISTATE?
AT+CPSMS?
AT+QSCLK?

11

AT+CGREG?
+CGREG: 0,4
OK

AT+COPS?
+COPS: 0,0,“AT&T”,8
OK

AT+CSQ
+CSQ: 23,99
OK

AT+CGACT?
+CGACT: 1,1
OK

AT+QISTATE?
OK

AT+CPSMS?
+CPSMS: 0,“01100000”,“00000000”
OK
Power Saving Mode

AT+QSCLK?
+QSCLK: 0
OK