SIM7000A POST not working

jack
Newbie

Posts: 3

SIM7000A POST not working Nov 1, 2022 15:09:54 GMT

Quote

Post by jack on Nov 1, 2022 15:09:54 GMT

Hello!

I am working on a project using the SIM7000A board where I will be POSTing an image to a web server. Unfortunately I am having some issues with the POST functionality provided in the library. As far as I can tell it is failing at this line:

if (! sendCheckReply(dataBuff, "DOWNLOAD", 120000))

Note that I have already tried updating the timeout to be a larger value. The library seems to fail here for me for both POSTing in the code I have written as well as in the provided LTE_demo. I have tried both my personal web server and the suggested one httpbin.org/post.

Here is the output of the commands as asked for in the FAQ section on GitHub.

09:26:23.394 -> FONA> D
09:26:28.113 -> Starting DEBUG
09:26:28.146 -> ---> ATI
09:26:28.178 -> <--- SIM7000A R1351
09:26:28.210 -> ---> AT+CGMR
09:26:28.274 -> <--- Revision:1351B03SIM7000A
09:26:28.306 -> ---> AT+CREG?
09:26:28.338 -> <--- +CREG: 0,5
09:26:28.402 -> ---> AT+CFUN?
09:26:28.402 -> <--- +CFUN: 1
09:26:28.467 -> ---> AT+CPIN?
09:26:28.500 -> <--- +CPIN: READY
09:26:28.533 -> ---> AT+COPS?
09:26:28.596 -> <--- +COPS: 0,0,"AT&T Hologram",7
09:26:28.629 -> ---> AT+CSQ
09:26:28.661 -> <--- +CSQ: 25,99
09:26:28.727 -> ---> AT+COPS=?
09:26:34.866 -> <--- +COPS: (1,"311 490","311 490","311490",7),(2,"AT&T","AT&T","310410",7),(1,"Verizon","Verizon","311480",7),(1,"313 100","313 100","313100",7),(1,"T-Mobile","T-Mobile","310260",7),,(0,1,2,3,4),(0,1,2)
09:26:35.093 ->
09:26:35.093 -> OK
09:26:35.093 -> FONA>

Please let me know if I am doing something wrong or if you need anymore information.

Thanks!

Botletics
Administrator

Posts: 117

SIM7000A POST not working Nov 2, 2022 19:54:15 GMT

Quote

Post by Botletics on Nov 2, 2022 19:54:15 GMT

Could you please also post your AT command log for the actual HTTP POST?

With LTE_Demo, use the "G" command to enable data, then use "2" to do an HTTP GET request. If that works, go to the switch statement that checks for the "2" command, comment out the HTTP GET request code, then uncomment the HTTP POST code and re-upload.

Last Edit: Nov 2, 2022 19:56:06 GMT by Botletics

jack
Newbie

Posts: 3

SIM7000A POST not working Nov 2, 2022 22:18:25 GMT

Quote

Post by jack on Nov 2, 2022 22:18:25 GMT

Sure thing!

Here is after running "G" and "2":

18:07:28.464 -> FONA> G

18:07:33.731 -> ---> AT+CIPSHUT

18:07:33.797 -> <--- SHUT OK

18:07:33.828 -> ---> AT+CGATT=1

18:07:33.828 -> <--- OK

18:07:33.893 -> ---> AT+SAPBR=3,1,"CONTYPE","GPRS"

18:07:33.925 -> <--- OK

18:07:34.154 -> ---> AT+SAPBR=3,1,"APN","hologram"

18:07:34.218 -> <--- OK

18:07:34.283 -> ---> AT+CSTT="hologram"

18:07:34.316 -> <--- OK

18:07:34.316 -> ---> AT+SAPBR=1,1

18:07:34.347 -> <--- OK

18:07:34.379 -> ---> AT+CIICR

18:07:34.412 -> <--- OK

18:07:34.412 -> FONA> 2

18:07:41.715 -> ---> AT+CBC

18:07:41.747 -> <--- +CBC: 0,89,4168

18:07:41.812 -> ---> AT+HTTPTERM

18:07:41.845 -> <--- ERROR

18:07:41.877 -> ---> AT+HTTPINIT

18:07:41.909 -> <--- OK

18:07:41.941 -> ---> AT+HTTPPARA="CID",1

18:07:41.973 -> <--- OK

18:07:42.005 -> ---> AT+HTTPPARA="URL","dweet.io/dweet/for/865235030719245?temp=745.38&batt=4168"

18:07:42.135 -> <--- OK

18:07:42.168 -> ---> AT+HTTPACTION=0

18:07:42.201 -> <--- OK

18:07:45.923 -> HTTP status: 200

18:07:45.923 -> Data length: 213

18:07:45.956 -> ---> AT+HTTPREAD

18:07:45.988 -> <--- +HTTPREAD: 213

18:07:46.213 -> <--- {"this":"succeeded","by":"dweeting","the":"dweet","with":{"thing":"865235030719245","created":"2022-11-02T22:07:45.214Z","content":{"temp":745.38,"batt":4168},"transaction":"f28ad274-c1ac-4e66-a2ac-2a7fc0240b8d"}}

18:07:46.438 -> ---> AT+HTTPTERM

18:07:46.470 -> <--- OK

18:07:46.470 -> FONA>

Looks like the GET request succeeded so here it is with POST

18:14:55.779 -> FONA> G

18:14:58.480 -> ---> AT+CIPSHUT

18:14:58.512 -> <--- SHUT OK

18:14:58.577 -> ---> AT+CGATT=1

18:14:59.717 -> <--- OK

18:14:59.750 -> ---> AT+SAPBR=3,1,"CONTYPE","GPRS"

18:14:59.783 -> <--- OK

18:15:00.040 -> ---> AT+SAPBR=3,1,"APN","hologram"

18:15:00.072 -> <--- OK

18:15:00.137 -> ---> AT+CSTT="hologram"

18:15:00.170 -> <--- OK

18:15:00.202 -> ---> AT+SAPBR=1,1

18:15:00.234 -> <--- OK

18:15:00.266 -> ---> AT+CIICR

18:15:00.266 -> <--- OK

18:15:00.298 -> FONA> 2

18:15:04.300 -> ---> AT+CBC

18:15:04.366 -> <--- +CBC: 0,87,4135

18:15:04.430 -> ---> AT+HTTPTERM

18:15:04.430 -> <--- ERROR

18:15:04.495 -> ---> AT+HTTPINIT

18:15:04.495 -> <--- OK

18:15:04.559 -> ---> AT+HTTPPARA="CID",1

18:15:04.592 -> <--- OK

18:15:04.625 -> ---> AT+HTTPPARA="URL","http://dweet.io/dweet/for/865235030719245"

18:15:04.722 -> <--- OK

18:15:04.754 -> ---> AT+HTTPPARA="CONTENT","application/json"

18:15:04.818 -> <--- OK

18:15:04.849 -> ---> AT+HTTPDATA=27,10000

18:15:04.882 -> <--- DOWNLOAD

18:15:04.914 -> ---> {"temp":749.07,"batt":4135}

18:15:15.080 -> <---

18:15:15.080 -> Failed to complete HTTP POST...

18:15:15.114 -> FONA>

18:15:15.276 -> OK

Just to be clear here is the code that I uncommented for this:

            // POST request

            

            sprintf(URL, "http://dweet.io/dweet/for/%s", imei);

            sprintf(body, "{\"temp\":%s,\"batt\":%i}", tempBuff, battLevel);

            

            if (!fona.postData("POST", URL, body)) // Can also add authorization token parameter!

              Serial.println(F("Failed to complete HTTP POST..."));

This appears consistent the with errors that I was seeing earlier.

jack
Newbie

Posts: 3

SIM7000A POST not working Nov 2, 2022 22:23:39 GMT

Quote

Post by jack on Nov 2, 2022 22:23:39 GMT

Alright I just ran another test. So I found this post on the Arduino forum, where someone was experience a similar issue. There fix was to add a delay between sending the command to the modem and reading its response. Sure enough if I add a delay in Adafruit_FONA::getReply such that the method is as follows:

uint8_t Adafruit_FONA::getReply(const char *send, uint16_t timeout) {
  flushInput();


  DEBUG_PRINT(F("\t---> ")); DEBUG_PRINTLN(send);


  mySerial->println(send);
  delay(1000);
  uint8_t l = readline(timeout);

  DEBUG_PRINT (F("\t<--- ")); DEBUG_PRINTLN(replybuffer);

  return l;
}

Running '2' appears to work!

18:17:51.834 -> G

18:17:51.866 -> ---> AT+CIPSHUT

18:17:51.899 -> <--- SHUT OK

18:17:51.930 -> ---> AT+CGATT=1

18:17:51.964 -> <--- OK

18:17:51.996 -> ---> AT+SAPBR=3,1,"CONTYPE","GPRS"

18:17:52.027 -> <--- OK

18:17:52.286 -> ---> AT+SAPBR=3,1,"APN","hologram"

18:17:52.318 -> <--- OK

18:17:52.382 -> ---> AT+CSTT="hologram"

18:17:52.414 -> <--- OK

18:17:52.446 -> ---> AT+SAPBR=1,1

18:17:52.480 -> <--- OK

18:17:52.512 -> ---> AT+CIICR

18:17:52.543 -> <--- OK

18:17:52.543 -> FONA> 2

18:17:58.747 -> ---> AT+CBC

18:17:58.778 -> <--- +CBC: 0,88,4149

18:17:58.843 -> ---> AT+HTTPTERM

18:17:58.843 -> <--- OK

18:17:58.907 -> ---> AT+HTTPINIT

18:17:58.907 -> <--- OK

18:17:58.971 -> ---> AT+HTTPPARA="CID",1

18:17:59.004 -> <--- OK

18:17:59.036 -> ---> AT+HTTPPARA="URL","http://dweet.io/dweet/for/865235030719245"

18:18:00.110 -> <--- OK

18:18:00.144 -> ---> AT+HTTPPARA="CONTENT","application/json"

18:18:00.207 -> <--- OK

18:18:00.239 -> ---> AT+HTTPDATA=27,10000

18:18:01.281 -> <--- DOWNLOAD

18:18:01.313 -> ---> {"temp":753.99,"batt":4149}

18:18:02.327 -> <--- OK

18:18:02.390 -> ---> AT+HTTPACTION=1

18:18:02.424 -> <--- OK

18:18:03.561 -> HTTP status: 200

18:18:03.594 -> Data length: 213

18:18:03.594 -> ---> AT+HTTPREAD

18:18:03.658 -> <--- +HTTPREAD: 213

18:18:03.887 -> <--- {"this":"succeeded","by":"dweeting","the":"dweet","with":{"thing":"865235030719245","created":"2022-11-02T22:18:03.506Z","content":{"temp":753.99,"batt":4149},"transaction":"81db86a0-a549-4716-a2b5-8d331e05a7e3"}}

18:18:04.113 -> ---> AT+HTTPTERM

18:18:04.113 -> <--- OK

18:18:04.145 -> FONA>

Not sure if this is the best fix in the world, but I don't mind putting up a PR if it would be helpful.

Botletics Administrator Posts: 117	SIM7000A POST not working Nov 2, 2022 23:03:57 GMT Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Botletics on Nov 2, 2022 23:03:57 GMT Thank you! But I think it'd be better to put the delay only where we need it, rather than in the getReply() function.
	Last Edit: Nov 2, 2022 23:15:13 GMT by Botletics

Post by jack on Nov 1, 2022 15:09:54 GMT

Post by Botletics on Nov 2, 2022 19:54:15 GMT

Post by jack on Nov 2, 2022 22:18:25 GMT

Post by jack on Nov 2, 2022 22:23:39 GMT

Post by Botletics on Nov 2, 2022 23:03:57 GMT