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Forum Index : Microcontroller and PC projects : WEB SCAN
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| Digger Newbie  Joined: 14/03/2024 Location: GermanyPosts: 6 |
Hi all, Running WEB SCAN repeatedly, even with pauses up to a minute between runs, seems to fail every second time: only the headline is put out. Why is this and how can I avoid it?Any help appreciated. Thanks. |
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TassyJim Guru  Joined: 07/08/2011 Location: AustraliaPosts: 5905 |
What router do you have? This sounds like a Fritzbox issue. Jim VK7JH MMedit MMBasic Help |
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| Digger Newbie Joined: 14/03/2024 Location: GermanyPosts: 6 |
Hi, At this point, when I am running WEB SCAN, I am not connected to any access point or router. I want to use WEB SCAN to map/track the location of the WebMite depending on the WiFi access points nearby. For this I would like to use MAC and RSSID of everything that listed as the result of WEB SCAN. Best regards |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 5905 |
When I am connected to an access point, WEB SCAN works every time. When I am not connected to an access point, my WEBmite behaves the same as you observed. WEB SCAN runs every second time with the other runs returning directly to the command prompt. One of my access points is a Fritzbox and there is a known problem with connecting to them. Every second attempt fails. Before I go to the effort of setting up a test site out of range of the Fritzbox, it would help me if I knew if any of your access points are a Fritzbox. I think that all Fritzbox mac addresses start with 38:10:d5 Jim VK7JH MMedit MMBasic Help |
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| Digger Newbie Joined: 14/03/2024 Location: GermanyPosts: 6 |
Thank you, Jim, for getting back. Indeed, my main access point is a FRITZ!box router. However, I have never connected my WebMite to it. Do you think, that the mere presence of the FRITZ!box is interfering? Like querying the FRITZ!Box for SSID etc. aborts the WEB SCAN? Possible, but why every second time only? Tomorrow I am going to test my WebMite in an environment without a FRITZ!Box and I will report here. Digger |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 5905 |
Please do the test without any Fritzbox within range. I am interested in your results. When I tested clear of the Fritz, the WEB SCAN still had problems but not the definite one works, the next one fails. This time I could get two or three fails then a run of success. In either case, if the WEBmite is connected to any access point, all WEB SCANs work without fail. One of life's little mysteries... Jim VK7JH MMedit MMBasic Help |
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| Digger Newbie Joined: 14/03/2024 Location: GermanyPosts: 6 |
It‘s getting more mysterious!  Just tested WEB SCAN in a different environment, no FRITZ!Box around. Same result, every other attempt failed. Positive scans showed 5 or more access points within reach. Then I went back to my home environment and tested again. This time, however, WEB SCAN succeeded (!) every time if the number of discovered access points was one or two only, even if one of them was the FRITZ!Box (by the way, the MAC of my FRITZ!Box starts with 44:4e:6d…). It is my impression that the WEB SCAN routine starts by printing „Performing WiFi scan“, then enters a subroutine with a timeout trying to discover local access points. If this subroutine has not finished timely, we get a failure. Alternatively, I think there could be a buffer overflow problem caused by a missing reset of the buffer when the subroutine stars. Anyway, I think this is a bug that deserves reporting… |
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| Digger Newbie Joined: 14/03/2024 Location: GermanyPosts: 6 |
… I would like to add… I started this project a few months ago using MicroPython. I remember that I ran into similar problems when scanning for access points. Had to loop until there was a result. Likewise, connecting to a network/access point is also unreliable in MicroPython. |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 5905 |
I think it should be noted in the manual that a number of scans may be required to find access points, especially when not connected. The FRitzbox does have issues when connecting but can not be blamed for the empty scans results. With similar problems using microPython, it looks like the problem is deep inside the pico API and no easy fix. At least we know and can allow for it. Jim VK7JH MMedit MMBasic Help |
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