MDNS : Also increase # of sends when a send fails #8641

hreintke · 2022-07-17T11:49:53Z

Related to #8308

This solves the root cause of the infinite sending of host probes when STA is not connected.

hreintke · 2022-07-17T14:02:03Z

@d-a-v : Cannot find the output on what is wrong with the style, only the fact that it is failing.

mcspr · 2022-07-17T14:36:33Z

Check the log of the style / formatting job; either by clicking the check line down below or Checks tab above.

hreintke · 2022-07-17T22:07:24Z

That is what I did but the info is :

+++ b/libraries/ESP[826](https://github.com/esp8266/Arduino/runs/7377371467?check_suite_focus=true#step:4:827)6mDNS/src/LEAmDNS_Control.cpp
@@ -1395,18 +1395,18 @@ namespace MDNSImplementation
             {
                 if ((bResult = _sendHostProbe()))
                 {
-                    DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(
-                        PSTR("[MDNSResponder] _updateProbeStatus: Did sent host probe to all links \n\n")););
+                    DEBUG_EX_INFO(
+                        DEBUG_OUTPUT.printf_P(PSTR("[MDNSResponder] _updateProbeStatus: Did sent "
+                                                   "host probe to all links \n\n")););
                 }

```


                 else
                 {
-                    DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(
-                        PSTR("[MDNSResponder] _updateProbeStatus: Did not sent host probe to all links\n\n")););
-
+                    DEBUG_EX_INFO(
+                        DEBUG_OUTPUT.printf_P(PSTR("[MDNSResponder] _updateProbeStatus: Did not "
+                                                   "sent host probe to all links\n\n")););
                 }
                 m_HostProbeInformation.m_Timeout.reset(MDNS_PROBE_DELAY);
                 ++m_HostProbeInformation.m_u8SentCount;
-
             }
             else  // Probing finished
             {
@@ -1430,7 +1430,7 @@ namespace MDNSImplementation
                  && (m_HostProbeInformation.m_Timeout.expired()))
         {
             _announce(true, false);  // Don't announce services here
-            
+
             ++m_HostProbeInformation.m_u8SentCount;
             if (MDNS_ANNOUNCE_COUNT > m_HostProbeInformation.m_u8SentCount)
@@ -1446,7 +1446,6 @@ namespace MDNSImplementation
                 DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(
                     PSTR("[MDNSResponder] _updateProbeStatus: Done host announcing.\n\n")););
             }
-            
         }
         //
@@ -1471,16 +1470,17 @@ namespace MDNSImplementation
                     if ((bResult = _sendServiceProbe(*pService)))
                     {
                         DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(
-                            PSTR("[MDNSResponder] _updateProbeStatus: Did sent service probe to all links "
+                            PSTR("[MDNSResponder] _updateProbeStatus: Did sent service probe to "
+                                 "all links "
                                  "(%u)\n\n"),
                             (pService->m_ProbeInformation.m_u8SentCount + 1)););
-
                     }
                     else
                     {
                         DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(
-                            PSTR("[MDNSResponder] _updateProbeStatus: Did not sent service probe to all links"
-                                "(%u)\n\n"),
+                            PSTR("[MDNSResponder] _updateProbeStatus: Did not sent service probe "
+                                 "to all links"
+                                 "(%u)\n\n"),
                             (pService->m_ProbeInformation.m_u8SentCount + 1)););
                     }
                     pService->m_ProbeInformation.m_Timeout.reset(MDNS_PROBE_DELAY);
@@ -1511,7 +1511,7 @@ namespace MDNSImplementation
                      && (pService->m_ProbeInformation.m_Timeout.expired()))
             {
                 _announceService(*pService);  // Announce service
-                
+
                 ++pService->m_ProbeInformation.m_u8SentCount;
                 if (MDNS_ANNOUNCE_COUNT > pService->m_ProbeInformation.m_u8SentCount)
@@ -1519,7 +1519,7 @@ namespace MDNSImplementation
                     pService->m_ProbeInformation.m_Timeout.reset(MDNS_ANNOUNCE_DELAY);
                     DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(
                         PSTR("[MDNSResponder] _updateProbeStatus: Announcing service %s.%s.%s "
-                                "(%d)\n\n"),
+                             "(%d)\n\n"),
                         (pService->m_pcName ?: m_pcHostname), pService->m_pcService,
                         pService->m_pcProtocol, pService->m_ProbeInformation.m_u8SentCount););
                 }
@@ -1528,11 +1528,10 @@ namespace MDNSImplementation
                     pService->m_ProbeInformation.m_Timeout.resetToNeverExpires();
                     DEBUG_EX_INFO(
                         DEBUG_OUTPUT.printf_P(PSTR("[MDNSResponder] _updateProbeStatus: Done "
-                                                    "service announcing for %s.%s.%s\n\n"),
-                                                (pService->m_pcName ?: m_pcHostname),
-                                                pService->m_pcService, pService->m_pcProtocol););
+                                                   "service announcing for %s.%s.%s\n\n"),
+                                              (pService->m_pcName ?: m_pcHostname),
+                                              pService->m_pcService, pService->m_pcProtocol););
                 }
-                
             }
         }
         DEBUG_EX_ERR(if (!bResult) {
Error: Process completed with exit code 1.+++ b/libraries/ESP[826](https://github.com/esp8266/Arduino/runs/7377371467?check_suite_focus=true#step:4:827)6mDNS/src/LEAmDNS_Control.cpp
@@ -1395,18 +1395,18 @@ namespace MDNSImplementation
             {
                 if ((bResult = _sendHostProbe()))
                 {
-                    DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(
-                        PSTR("[MDNSResponder] _updateProbeStatus: Did sent host probe to all links \n\n")););
+                    DEBUG_EX_INFO(
+                        DEBUG_OUTPUT.printf_P(PSTR("[MDNSResponder] _updateProbeStatus: Did sent "
+                                                   "host probe to all links \n\n")););
                 }
                 else
                 {
-                    DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(
-                        PSTR("[MDNSResponder] _updateProbeStatus: Did not sent host probe to all links\n\n")););
-
+                    DEBUG_EX_INFO(
+                        DEBUG_OUTPUT.printf_P(PSTR("[MDNSResponder] _updateProbeStatus: Did not "
+                                                   "sent host probe to all links\n\n")););
                 }
                 m_HostProbeInformation.m_Timeout.reset(MDNS_PROBE_DELAY);
                 ++m_HostProbeInformation.m_u8SentCount;
-
             }
             else  // Probing finished
             {
@@ -1430,7 +1430,7 @@ namespace MDNSImplementation
                  && (m_HostProbeInformation.m_Timeout.expired()))
         {
             _announce(true, false);  // Don't announce services here
-            
+
             ++m_HostProbeInformation.m_u8SentCount;
             if (MDNS_ANNOUNCE_COUNT > m_HostProbeInformation.m_u8SentCount)
@@ -1446,7 +1446,6 @@ namespace MDNSImplementation
                 DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(
                     PSTR("[MDNSResponder] _updateProbeStatus: Done host announcing.\n\n")););
             }
-            
         }
         //
@@ -1471,16 +1470,17 @@ namespace MDNSImplementation
                     if ((bResult = _sendServiceProbe(*pService)))
                     {
                         DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(
-                            PSTR("[MDNSResponder] _updateProbeStatus: Did sent service probe to all links "
+                            PSTR("[MDNSResponder] _updateProbeStatus: Did sent service probe to "
+                                 "all links "
                                  "(%u)\n\n"),
                             (pService->m_ProbeInformation.m_u8SentCount + 1)););
-
                     }
                     else
                     {
                         DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(
-                            PSTR("[MDNSResponder] _updateProbeStatus: Did not sent service probe to all links"
-                                "(%u)\n\n"),
+                            PSTR("[MDNSResponder] _updateProbeStatus: Did not sent service probe "
+                                 "to all links"
+                                 "(%u)\n\n"),
                             (pService->m_ProbeInformation.m_u8SentCount + 1)););
                     }
                     pService->m_ProbeInformation.m_Timeout.reset(MDNS_PROBE_DELAY);
@@ -1511,7 +1511,7 @@ namespace MDNSImplementation
                      && (pService->m_ProbeInformation.m_Timeout.expired()))
             {
                 _announceService(*pService);  // Announce service
-                
+
                 ++pService->m_ProbeInformation.m_u8SentCount;
                 if (MDNS_ANNOUNCE_COUNT > pService->m_ProbeInformation.m_u8SentCount)
@@ -1519,7 +1519,7 @@ namespace MDNSImplementation
                     pService->m_ProbeInformation.m_Timeout.reset(MDNS_ANNOUNCE_DELAY);
                     DEBUG_EX_INFO(DEBUG_OUTPUT.printf_P(
                         PSTR("[MDNSResponder] _updateProbeStatus: Announcing service %s.%s.%s "
-                                "(%d)\n\n"),
+                             "(%d)\n\n"),
                         (pService->m_pcName ?: m_pcHostname), pService->m_pcService,
                         pService->m_pcProtocol, pService->m_ProbeInformation.m_u8SentCount););
                 }
@@ -1528,11 +1528,10 @@ namespace MDNSImplementation
                     pService->m_ProbeInformation.m_Timeout.resetToNeverExpires();
                     DEBUG_EX_INFO(
                         DEBUG_OUTPUT.printf_P(PSTR("[MDNSResponder] _updateProbeStatus: Done "
-                                                    "service announcing for %s.%s.%s\n\n"),
-                                                (pService->m_pcName ?: m_pcHostname),
-                                                pService->m_pcService, pService->m_pcProtocol););
+                                                   "service announcing for %s.%s.%s\n\n"),
+                                              (pService->m_pcName ?: m_pcHostname),
+                                              pService->m_pcService, pService->m_pcProtocol););
                 }
-                
             }
         }
         DEBUG_EX_ERR(if (!bResult) {
Error: Process completed with exit code 1.

I don't know how to proceed with that

mcspr · 2022-07-18T09:11:15Z

Style job expects that the code is clang-format'ed; either apply the diff with patch / git-patch, or bash tools/restyle.sh <path-to-the-lea-cpp>

On topic, these announces are simply not essential? Couldn't we introduce a longer wait time when it is failing? (like exponential back-off, or simply add a fixed number)

hreintke · 2022-07-18T10:18:21Z

The probes/announces are there to :
1/ Verify that the hostname/service is not in use on another system.
2/ Let the network know which hostname/service is available on this system.

On timing :
This should be a process which is quick as the result is whether a base config as hostname is correct to use.
That is why I am not in favor of extending probe timing.

On Probe result.
The current implementation verifies this on the links that are "UP". If on all of these the probing doesn't show a conflicting host/service it considers it OK and does a "Probe OK" callback. In principle, the STA link is not in "UP state" -> I do not know (yet ?) why the "not connected STA" is considered UP. To make it working as defined, I decided to ignore the error completely.

One might discuss whether a "not UP link" or a link with errors should callback a Probe failed.
But that changes current MDNS behavior and is a breaking change, which I think should not be done in a 3.0 -> 3.1 release.

mcspr · 2022-07-18T14:01:09Z

OK. Lea approach is still a bit convoluted, but at least we get rid of this edge case.

Regarding UP, I think we need to look at glue layer. I just noticed these bits

where we initially call set addr (with whatever values) https://github.com/d-a-v/esp82xx-nonos-linklayer/blob/06164fbd55770b0dbb4f52a092f4b924e84f9b8a/glue-esp/lwip-esp.c#L588
internals do a check for non-zero IP once https://github.com/d-a-v/esp82xx-nonos-linklayer/blob/06164fbd55770b0dbb4f52a092f4b924e84f9b8a/glue-lwip/lwip-git.c#L419
but forget it in the next piece when calling esp2glue_netif_set_up1down0 https://github.com/d-a-v/esp82xx-nonos-linklayer/blob/06164fbd55770b0dbb4f52a092f4b924e84f9b8a/glue-lwip/lwip-git.c#L508

@d-a-v might have some explanation as to why it is that way
(or SDK somehow needs this behaviour b/c it is expecting the wrong thing)

d-a-v · 2022-07-18T16:13:43Z

@hreintke

In principle, the STA link is not in "UP state"
-> I do not know (yet ?) why the "not connected STA" is considered UP. To make it working as defined, I decided to ignore the error completely.

I assume this is #8308 (comment)

@mcspr I can't seem to remember whether you've been working on LwipIntf::stateUpCB recently
(otherwise this is a bug that is external to this PR and should be fixed independently)

but forget it in the next piece when calling esp2glue_netif_set_up1down0

Counterpart is there => lwIP => lwIP

mcspr · 2022-07-18T17:55:18Z

@hreintke

In principle, the STA link is not in "UP state"
-> I do not know (yet ?) why the "not connected STA" is considered UP. To make it working as defined, I decided to ignore the error completely.

I assume this is #8308 (comment)

@mcspr I can't seem to remember whether you've been working on LwipIntf::stateUpCB recently (otherwise this is a bug that is external to this PR and should be fixed independently)

but forget it in the next piece when calling esp2glue_netif_set_up1down0

Counterpart is there => lwIP => lwIP

Right, but I meant this with debugging enabled

0:<buffered:
1:lwESP: lwip_init
2:GLUE: lwip_init
3:GLUE: netif_sta_init
4:GLUE: netif_ap_init
5::dereffub>
6:lwESP: netif_add
7:lwESP: netif_add(ip:0) -> lwESP: netif_set_addr(0->0)
8:lwESP: check netif @0x3ffefcbc (sta@0x3ffefcbc ap@0x00000000)
9:lwESP: NEW netif
10:lwESP: esp-@0x3ffefcbc idx=0 STA name=ew0 state=0x3ffefa0c 2c:f4:32:4a:29:14|BROADCAST|LINK_UP|ETHARP|IGMP ip=0.0.0.0 mask=0.0.0.0 gw=0.0.0.0
11:lwESP: netif_add
12:lwESP: netif_add(ip:0) -> lwESP: netif_set_addr(0->0)
13:lwESP: check netif @0x3ffefcbc (sta@0x3ffefcbc ap@0x00000000)
14:lwESP: netif (0): already added
15:lwESP: esp-@0x3ffefcbc idx=0 STA name=ew0 state=0x3ffefa0c 2c:f4:32:4a:29:14 ip=0.0.0.0 mask=0.0.0.0 gw=0.0.0.0
16:GLUE: netif updated:
17:GLUE: netif 0: set up
18:GLUE: lwip-@0x3ffeeb58 idx=0(station) mtu=1500 state=0x00000000 2c:f4:32:4a:29:14|UP|BROADCAST|LINK_UP|ETHARP|IGMP ip=0.0.0.0 mask=0.0.0.0 gw=0.0.0.0 <<< UP???

d-a-v · 2022-07-18T21:24:50Z

18:GLUE: lwip-@0x3ffeeb58 idx=0(station) mtu=1500 state=0x00000000 2c:f4:32:4a:29:14|UP|BROADCAST|LINK_UP|ETHARP|IGMP ip=0.0.0.0 mask=0.0.0.0 gw=0.0.0.0 <<< UP???

There is the flag UP and LINK_UP
UP is when an IP address is assigned (following dhcp answer, or static setup)
LINK_UP is when link layer is up (WiFi associated, Ethernet powered up ...)
For example, one can get LINK_UP without UP when a dhcp request is made and before an answer lands back

It is true that ip-not-set and UP state are not compatible, and you points me here and there.

Maybe the the second link

		//netif_set_up(netif); // unwanted call to netif_sta_status_callback()
		netif->flags |= NETIF_FLAG_UP;

should be something like

		if (ip_addr_isany(&netif->ip_addr)))
		    netif_set_down(netif); // or test first whether it is already down
 		else
		    netif_set_up(netif); // or test first whether it is already up

(tests in comments are there because one has to be careful with the number of times netif callbacks are used)

d-a-v

The mdns clock example runs fine with both AP and STA enabled
approving, noting that

the netif up state case in comments is an external issue
I may have not tested all cases (ap-sta -> ap -> off -> sta -> ap_sta ...)

hreintke · 2022-07-18T21:46:37Z

I have been looking at the same code this afternoon 😃 .
@mcspr @d-a-v : How can I enable the lwip debug output ?

d-a-v · 2022-07-18T21:48:53Z

How can I enable the lwip debug output ?

There for the glue (@mcspr's debug log) and 5 lines below for lwIP.

edit: lwip2 must be recompiled

hreintke · 2022-07-18T21:49:32Z

@d-a-v : The check should be whether the clock example is running OK when mode = AP_STA and STA is not connected.

d-a-v · 2022-07-18T21:54:10Z

The check should be whether the clock example is running OK when mode = AP_STA and STA is not connected.

Maybe you should update the example to enable it with both AP and STA.
I used this patch and checked with 'Service Browser' android app while on LAN (STA) or connected to the AP.

diff --git a/libraries/ESP8266mDNS/examples/LEAmDNS/mDNS_Clock/mDNS_Clock.ino b/libraries/ESP8266mDNS/examples/LEAmDNS/mDNS_Clock/mDNS_Clock.ino
index 6234e9f10..33c7a7f17 100644
--- a/libraries/ESP8266mDNS/examples/LEAmDNS/mDNS_Clock/mDNS_Clock.ino
+++ b/libraries/ESP8266mDNS/examples/LEAmDNS/mDNS_Clock/mDNS_Clock.ino
@@ -210,7 +210,8 @@ void setup(void) {
   Serial.begin(115200);
 
   // Connect to WiFi network
-  WiFi.mode(WIFI_STA);
+  WiFi.mode(WIFI_AP_STA);
+  WiFi.softAP("ESPap", "thereisnospoon");
   WiFi.begin(ssid, password);
   Serial.println("");

(weird AP credentials are borrowed from another example)

hreintke · 2022-07-18T22:27:33Z

@d-a-v

edit: lwip2 must be recompiled

That will be a challenge for me.
Any chance that you can create a liblwip2-1460.a for me with debugging enabled ?

Also increase # of sends when a send fails

cbffd5e

style update

e7a7c0c

d-a-v added this to the 3.1 milestone Jul 18, 2022

d-a-v added the component: MDNS label Jul 18, 2022

d-a-v approved these changes Jul 18, 2022

View reviewed changes

Merge branch 'master' into MDNS_Issue

3591cb0

mcspr merged commit e2a36ed into esp8266:master Jul 27, 2022

d-a-v mentioned this pull request Sep 13, 2022

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MDNS : Also increase # of sends when a send fails #8641

MDNS : Also increase # of sends when a send fails #8641

hreintke commented Jul 17, 2022

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hreintke commented Jul 18, 2022

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hreintke commented Jul 18, 2022

MDNS : Also increase # of sends when a send fails #8641

MDNS : Also increase # of sends when a send fails #8641

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