ESP8266: Add built-in hostname resolution handling (disabled by default) #12234

michalpasztamobica · 2020-01-09T20:14:30Z

Summary of changes

Fixes #11982 (some routers fail to work with the UDPSocket-approach, but are proved to work when ESP uses its embedded hostname resolution AT command).

The feature is disabled by default and can be enabled in mbed_app.json with "esp8266.built-in-dns": true. When enabled then the synchronous hostname resolution will use the ESP's CIPDOMAIN AT command, but asynchronous resolution will keep on using the UDPSockets as before (no point rewriting the nsapi_dns). Also caching does not work.

I tested with the netsocket-dns testsuite. Obviously caching tests often fail, but if lucky I can get 15/16 passes.

@zhiyong80, please verify if this works with your router.

Impact of changes

None, until user enables the esp8266.built-in-dns option.

Migration actions required

None.

Documentation

"help" section added to mbed_lib.json.

Pull request type

[] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[x] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

Test results

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

Reviewers

@AnttiKauppila
@VeijoPesonen
@SeppoTakalo
@zhiyong80

ciarmcom · 2020-01-09T22:00:40Z

@michalpasztamobica, thank you for your changes.
@AnttiKauppila @VeijoPesonen @SeppoTakalo @ARMmbed/mbed-os-ipcore @ARMmbed/mbed-os-maintainers please review.

zhiyong-ft · 2020-01-10T02:20:14Z

AT+CIPDOMAIN works but I still get -3009 error

AT> AT+CIPDOMAIN="httpbin.org"
AT? +CIPDOMAIN:%*15[^
]
%n
AT= +CIPDOMAIN:34.193.212.251

AT? OK
%n
AT= OK

HttpRequest failed (error code -3009)

michalpasztamobica · 2020-01-10T07:19:18Z

I just pushed an astyle error fix. Still waiting for feedback from @zhiyong80 , in the issue report there is hope that his will work.
Please, bear in mind, only the simplest synchronous gethostbyname() will use the CIPDOMAIN AT command.

kjbracey · 2020-01-10T07:59:12Z

Fine as long as it's off by default. We did at some point use the built-in resolver, but stopped doing so because (at least in the firmware at the time) it failed to cope with some responses containing long names from some Amazon cloud servers.

michalpasztamobica · 2020-01-10T08:07:23Z

@kjbracey-arm , yep, I have also found the Espressif forum topic on this 64B response limitation...

This feature is added with minimum effort (no cache'ing, no async operation) to address a very specific usecase reported by @zhiyong80 . It will be kept off by default.

zhiyong-ft · 2020-01-10T17:41:42Z

Just tested the commit a33d397 . When buil-in-dns is turned on, modified mbed-http-example with added ntp works just fine. When built-in-dns is turned off, the same old problem happens again. So as far as the DNS problem is concerned, I believe the referenced commit solves the problem.

Unfortunately, the out of memory problem when -3009 error is thrown creeped back again. I thought I figured out, but no.

Test code:

#include "select-demo.h"

#if DEMO == DEMO_HTTP

#include "mbed.h"
#include "http_request.h"
#include "network-helper.h"
#include "mbed_mem_trace.h"
#include "NTPClient/NTPClient.h"
#include "pins.h"

DigitalOut espEn(ESP_EN);
DigitalOut espRst(ESP_RST);
DigitalIn espBoot(ESP_BOOT, PullNone);

void dump_response(HttpResponse* res) {
    printf("Status: %d - %s\n", res->get_status_code(), res->get_status_message().c_str());

    printf("Headers:\n");
    for (size_t ix = 0; ix < res->get_headers_length(); ix++) {
        printf("\t%s: %s\n", res->get_headers_fields()[ix]->c_str(), res->get_headers_values()[ix]->c_str());
    }
    printf("\nBody (%d bytes):\n\n%s\n", res->get_body_length(), res->get_body_as_string().c_str());
}

Timer t;

int main() {
    time_t curtime = time(NULL);
    printf("System started at: %s\r", ctime(&curtime));
    espEn = 1;
    espRst = 1;
    wait(10.0);
    // Connect to the network with the default networking interface
    // if you use WiFi: see mbed_app.json for the credentials
    NetworkInterface* network = connect_to_default_network_interface();
    if (!network) {
        printf("Cannot connect to the network, see serial output\n");
        return 1;
    }
    NTPClient ntp(network);
    ntp.setTime("pool.ntp.org");
    curtime = time(NULL);
    printf("RTC time set to: %s\r\n", ctime(&curtime));

    for (size_t i = 0; i < 1; i++)
    {
        // By default the body is automatically parsed and stored in a buffer, this is memory heavy.
        // To receive chunked response, pass in a callback as last parameter to the constructor.
        t.reset();
        HttpRequest* get_req = new HttpRequest(network, HTTP_GET, "http://httpbin.org/status/418");

        HttpResponse* get_res = get_req->send();
        if (!get_res) {
            printf("HttpRequest failed (error code %d)\n", get_req->get_error());
        }

        printf("\n----- HTTP GET response -----\n");
        dump_response(get_res);

        delete get_req;
    }

    wait(osWaitForever);
}

#endif

Stdio output with ESP8266 in debug mode, and built-in-dns turned on:

System started at: Thu Jan  1 00:00:00 1970

[NWKH] Connecting to network...
AT> AT
AT? OK
%n
AT< AT
AT= OK

AT> AT+RST
AT? OK
%n
AT< AT+RST
AT= OK

AT? %n
AT? %n
AT<  ets Jan  8 2013,rst cause:1, boot mode:(3,2)
AT< load 0x40100000, len 2592, room 16 
AT< tail 0
AT< chksum 0xf3
AT< load 0x3ffe8000, len 764, room 8 
AT< tail 4
AT< chksum 0x92
AT< load 0x3ffe82fc, len 676, room 4 
AT< tail 0
AT< chksum 0x22
AT< csum 0x22
AT< 2nd boot version : 1.7(5d6f877)
AT< SPI Speed : 40MHz
AT< SPI Mode : QIO
AT< SPI Flash Size & Map: 16Mbit(1024KB+1024KB)
AT< jump to run user1 @ 1000
AT? %n
AT< üŒ…2�±0x1fc000ŒâœAT! ready
AT? %n
AT< 
AT? %n
AT> AT
AT? OK
%n
AT< AT
AT= OK

AT> ATE0
AT? OK
%n
AT< ATE0
AT= OK

AT> AT+UART_CUR=115200,8,1,0,3
AT? OK
%n
AT= OK

AT> AT+GMR
AT? AT version:%*d.%*d.%*d.%*d%n
AT= AT version:1.7.0.0
AT? OK
%n
AT< (Aug 16 2018 00:57:04)
AT< SDK version:3.0.0(d49923c)
AT< compile time:Aug 23 2018 16:58:12
AT< Bin version(Wroom 02):v1.7.0
AT= OK

AT> AT+GMR
AT? SDK version:%*d.%*d.%*d%n
AT< AT version:1.7.0.0(Aug 16 2018 00:57:04)
AT= SDK version:3.0.0
AT? OK
%n
AT< (d49923c)
AT< compile time:Aug 23 2018 16:58:12
AT< Bin version(Wroom 02):v1.7.0
AT= OK

AT> AT+CWMODE_DEF=1
AT? OK
%n
AT= OK

AT> AT+CWCOUNTRY_DEF=0,"US",1,13
AT? OK
%n
AT= OK

AT> AT+CWCOUNTRY_CUR=0,"US",1,13
AT? OK
%n
AT= OK

AT> AT+CIPRECVMODE=1
AT? OK
%n
AT= OK

AT> AT+CWMODE_CUR=1
AT? OK
%n
AT= OK

AT> AT+CIPMUX=1
AT? OK
%n
AT= OK

AT> AT+CWDHCP_CUR=1,1
AT? OK
%n
AT= OK

AT> AT+CWJAP_CUR="SSID","PASSWORD"
AT? OK
%n
AT! WIFI 
AT? %*12[^"]
%n
AT= CONNECTED

AT? OK
%n
AT! WIFI 
AT? %*12[^"]
%n
AT= GOT IP

AT? OK
%n
AT= OK

AT[NWKH] Connected to the network
? %n
AT> AT+CIFSR
AT? +CIFSR:STAIP,"%*15[^"]"%n
AT= +CIFSR:STAIP,"192.168.1.70"
AT? OK
%n
AT< 
AT< +CIFSR:STAMAC,"b4:e6:2d:6b:13:af"
AT= OK

[NWKH] IP address: 192.168.1.70
AT> AT+CIPDOMAIN="pool.ntp.org"
AT? +CIPDOMAIN:%*15[^
]
%n
AT= +CIPDOMAIN:208.76.53.137

AT? OK
%n
AT= OK

AT? %n
AT? %n
AT> AT+CIPSTART=0,"UDP","208.76.53.137",123
AT? OK
%n
AT< 0,CONNECT
AT= OK

AT> AT+CIPSEND=0,48
AT? >%n
AT! OK
AT? >%n
AT< 
AT= >
AT? SEND OK%n
AT<  
AT< Recv 48 bytes
AT= SEND OK
AT? %n
AT< 
AT? %n
AT? %n
AT? %n
AT? %n
AT? %n
AT? %n
AT! +IPD
AT? ,%*d,%n
AT= ,0,
AT? %*d:%n
AT= 48:
AT? %n
AT? %n
AT> AT+CIPCLOSE=0
AT? OK
%n
AT! 0,CLOSED
AT? OK
%n
AT< 
AT= OK

RTC time set to: Fri Jan 10 17:19:31 2020

AT> AT+CIPDOMAIN="httpbin.org"
AT? +CIPDOMAIN:%*15[^
]
%n
AT= +CIPDOMAIN:34.193.212.251

AT? OK
%n
AT= OK

AT? %n
AT> AT+CIPSTART=0,"TCP","34.193.212.251",80
AT? OK
%n
AT< 0,CONNECT
AT= OK

AT? %n
AT> AT+CIPSEND=0,47
AT? >%n
AT! OK
AT? >%n
AT< 
AT= >
AT? SEND OK%n
AT<  
AT< Recv 47 bytes
AT= SEND OK
AT? %n
AT< 
AT? %n
AT? %n
AT? %n
AT? %n
AT! +IPD
AT? ,%*d,%n
AT= ,0,
AT? %*d
%n
AT= 516

AT? %n
AT? %n
AT> AT+CIPRECVDATA=0,2048
AT? OK
%n
AT! +CIPRECVDATA,
AT? %*ld:%n
AT= 516:
AT? OK
%n
AT< 
AT= OK

AT? %n
AT> AT+CIPCLOSE=0
AT? OK
%n
AT! 0,CLOSED
AT? OK
%n
AT< 
AT= OK


----- HTTP GET response -----
Status: 418 - I'M A TEAPOT
Headers:
	Access-Control-Allow-Credentials: true
	Access-Control-Allow-Origin: *
	Date: Fri, 10 Jan 2020 17:19:31 GMT
	Referrer-Policy: no-referrer-when-downgAT? %n
rade
	Server: nginx
	X-Content-Type-Options: nosniff
	X-Frame-Options: DENY
	x-more-info: http://tools.ietf.org/html/rfc2324
	X-XSS-Protection: 1; mode=block
	Content-Length: 135
	Connection: keep-alive

Body (135 bytes):


    -=[ teapot ]=-

       _...._
     .'  _ _ `.
    | ."` ^ `". _,
    \_;`"---"`|//
      |       ;/
      \_     _/
        `"""`

Stdio output when built-in-dns is turned off:


[NWKH] Connecting to network...
AT> AT
AT? OK
%n
AT< AT
AT= OK

AT> AT+RST
AT? OK
%n
AT< AT+RST
AT= OK

AT? %n
AT? %n
AT<  ets Jan  8 2013,rst cause:1, boot mode:(3,7)
AT< load 0x40100000, len 2592, room 16 
AT< tail 0
AT< chksum 0xf3
AT< load 0x3ffe8000, len 764, room 8 
AT< tail 4
AT< chksum 0x92
AT< load 0x3ffe82fc, len 676, room 4 
AT< tail 0
AT< chksum 0x22
AT< csum 0x22
AT< 2nd boot version : 1.7(5d6f877)
AT< SPI Speed : 40MHz
AT< SPI Mode : QIO
AT< SPI Flash Size & Map: 16Mbit(1024KB+1024KB)
AT< jump to run user1 @ 1000
AT? %n
AT< üŒ…2�±0x1fc000ŒâœAT! ready
AT? %n
AT< 
AT? %n
AT> AT
AT? OK
%n
AT< AT
AT= OK

AT> ATE0
AT? OK
%n
AT< ATE0
AT= OK

AT> AT+UART_CUR=115200,8,1,0,3
AT? OK
%n
AT= OK

AT> AT+GMR
AT? AT version:%*d.%*d.%*d.%*d%n
AT= AT version:1.7.0.0
AT? OK
%n
AT< (Aug 16 2018 00:57:04)
AT< SDK version:3.0.0(d49923c)
AT< compile time:Aug 23 2018 16:58:12
AT< Bin version(Wroom 02):v1.7.0
AT= OK

AT> AT+GMR
AT? SDK version:%*d.%*d.%*d%n
AT< AT version:1.7.0.0(Aug 16 2018 00:57:04)
AT= SDK version:3.0.0
AT? OK
%n
AT< (d49923c)
AT< compile time:Aug 23 2018 16:58:12
AT< Bin version(Wroom 02):v1.7.0
AT= OK

AT> AT+CWMODE_DEF=1
AT? OK
%n
AT= OK

AT> AT+CWCOUNTRY_DEF=0,"US",1,13
AT? OK
%n
AT= OK

AT> AT+CWCOUNTRY_CUR=0,"US",1,13
AT? OK
%n
AT= OK

AT> AT+CIPRECVMODE=1
AT? OK
%n
AT= OK

AT> AT+CWMODE_CUR=1
AT? OK
%n
AT= OK

AT> AT+CIPMUX=1
AT? OK
%n
AT= OK

AT> AT+CWDHCP_CUR=1,1
AT? OK
%n
AT= OK

AT> AT+CWJAP_CUR="SSID","PASSWORD"
AT? OK
%n
AT! WIFI 
AT? %*12[^"]
%n
AT= DISCONNECT

AT? OK
%n
AT! WIFI 
AT? %*12[^"]
%n
AT= CONNECTED

AT? OK
%n
AT! WIFI 
AT? %*12[^"]
%n
AT= GOT IP

AT? OK
%n
AT= OK

AT[NWKH] Connected to the network
? %n
AT> AT+CIFSR
AT? +CIFSR:STAIP,"%*15[^"]"%n
AT= +CIFSR:STAIP,"192.168.1.70"
AT? OK
%n
AT< 
AT< +CIFSR:STAMAC,"b4:e6:2d:6b:13:af"
AT= OK

[NWKH] IP address: 192.168.1.70
AT> AT+CIFSR
AT? +CIFSR:STAIP,"%*15[^"]"%n
AT= +CIFSR:STAIP,"192.168.1.70"
AT? OK
%n
AT< 
AT< +CIFSR:STAMAC,"b4:e6:2d:6b:13:af"
AT= OK

AT? %n
AT> AT+CIPSTART=0,"UDP","8.8.8.8",53
AT? OK
%n
AT< 0,CONNECT
AT= OK

AT> AT+CIPSEND=0,30
AT? >%n
AT! OK
AT? >%n
AT< 
AT= >
AT? SEND OK%n
AT<  
AT< Recv 30 bytes
AT= SEND OK
AT? %n
AT< 
AT? %n
AT? %n
AT? %n
AT? %n
AT? %n
AT> AT+CIPCLOSE=0
AT? OK
%n
AT! 0,CLOSED
AT? OK
%n
AT< 
AT= OK

error: 'gethostbyname("pool.ntp.org")' failed with code -3009
AT? %n
AT> AT+CIPSTART=0,"UDP","",123
AT? OK
%n
AT< IP ERROR
AT! ERROR
AT(Aborted)
AT> AT+CIPSTART=0,"UDP","",123
AT? OK
%n
AT< 
AT< IP ERROR
AT! ERROR
AT(Aborted)
RTC time set to: Fri Jan 10 17:28:02 2020

AT> AT+CIFSR
AT? +CIFSR:STAIP,"%*15[^"]"%n
AT< 
AT= +CIFSR:STAIP,"192.168.1.70"
AT? OK
%n
AT< 
AT< +CIFSR:STAMAC,"b4:e6:2d:6b:13:af"
AT= OK

AT? %n
AT> AT+CIPSTART=1,"UDP","8.8.8.8",53
AT? OK
%n
AT< 1,CONNECT
AT= OK

AT? %n
AT> AT+CIPSEND=1,29
AT? >%n
AT! OK
AT? >%n
AT< 
AT= >
AT? SEND OK%n
AT<  
AT< Recv 29 bytes
AT= SEND OK
AT? %n
AT< 
AT? %n
AT? %n
AT? %n
AT? %n
AT? %n
AT> AT+CIPCLOSE=1
AT? OK
%n
AT! 1,CLOSED
AT? OK
%n
AT< 
AT= OK

HttpRequest failed (error code -3009)

----- HTTP GET response -----


++ MbedOS Error Info ++
Error Status: 0x8001011F Code: 287 Module: 1
Error Message: Operator new out of memory

Location: 0x800B449
Error Value: 0x800E166
Current Thread: main Id: 0x20002314 Entry: 0x800BB07 StackSize: 0x2000 StackMem: 0x20002BF0 SP: 0x20004A5C 
For more info, visit: https://mbed.com/s/error?error=0x8001011F&tgt=NUCLEO_F401RE
-- MbedOS Error Info --

michalpasztamobica · 2020-01-10T17:47:42Z

@zhiyong80 , just to make sure I got it right...
"built-in-dns" : false -> -3009 from gethostbyname from one unfortunate router
"built-in-dns" : true -> no errors even from the one unfortunate router
If so, then it sounds like the problem is solved.

@AnttiKauppila , @SeppoTakalo , @VeijoPesonen , may I ask for a code review, please?

zhiyong-ft · 2020-01-10T18:10:34Z

@zhiyong80 , just to make sure I got it right...
"built-in-dns" : false -> -3009 from gethostbyname from one unfortunate router
"built-in-dns" : true -> no errors even from the one unfortunate router
If so, then it sounds like the problem is solved.

@AnttiKauppila , @SeppoTakalo , @VeijoPesonen , may I ask for a code review, please?

Yes, the -3009 error only shows up when built-in-dns equals to false. The would be confirmed by:

AT> AT+CIPSTART=0,"UDP","8.8.8.8",53

0xc0170 · 2020-01-13T09:35:04Z

CI started

mbed-ci · 2020-01-13T10:41:27Z

Test run: SUCCESS

Summary: 11 of 11 test jobs passed
Build number : 1
Build artifacts

ciarmcom requested review from a team, AnttiKauppila, SeppoTakalo and VeijoPesonen January 9, 2020 22:00

ciarmcom added the needs: review label Jan 9, 2020

ESP8266: Add built-in DNS resolution (disabled by default)

f032274

michalpasztamobica force-pushed the esp8266_builtin_dns branch from a33d397 to f032274 Compare January 10, 2020 07:17

VeijoPesonen approved these changes Jan 13, 2020

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AnttiKauppila approved these changes Jan 13, 2020

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0xc0170 approved these changes Jan 13, 2020

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0xc0170 added needs: CI and removed needs: review labels Jan 13, 2020

0xc0170 added ready for merge release-version: 6.0.0-alpha-2 Second pre-release version of 6.0.0 and removed needs: CI ready for merge labels Jan 13, 2020

0xc0170 merged commit 194fc66 into ARMmbed:master Jan 15, 2020

michalpasztamobica mentioned this pull request Mar 25, 2020

ESP8266 set_network static function not working. #12552

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michalpasztamobica commented Jan 9, 2020

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