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Forum Index : Microcontroller and PC projects : mmqtt_publish:TCP Disconnected
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| JohnS Guru  Joined: 18/11/2011 Location: United KingdomPosts: 3802 |
Sounds like the WiFi chip remembers the IP addr. One for Peter? (does it remember it? can it be cleared?) John |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6099 |
DHCP will remember the address until it's lease time is up and the renew fails. Then what happens can vary. Leases times can be anything from a few minutes to hours. Relying on a 'valid' IP address to indicate maintained connectivity is not a good idea. Jim VK7JH MMedit MMBasic Help |
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Dinosaur Guru Joined: 12/08/2011 Location: AustraliaPosts: 311 |
Hi All Is DHCP involved on the Pico ? , because if it isn't, then note that the Rpi-Zero and the hotspot it provides is powered off. I would love to hear how else I can check with MMBasic commands if there is a connection available ? Shame we don't have a "Shell" or Ping command. After sunset the Zero will go off (to conserve power) but the Pico will run 24/7 and keep calculating A/H usage. So the pico is going to lose the connection, and I have to stop trying to connect. In situ, I can check the time and include that in the decision, but prefer to have confirmation that the hotspot is not available. EDit: Is there library code available. Reading the "Connecting to the Internet with the Raspberry Pi W" there are C/C++ functions such as: Edited 2023-11-25 06:06 by Dinosaur Regards Hervey Bay Qld. |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6099 |
I am only going on the information you provided. (Password changed because I prefer not to advertise) That tells me that you are using DHCP to get the IP from your hotspot. I have no idea how long the lease is. That is up to your hotspot. On my home network leases are valid for 1 hour. This usually means the client will renew it's lease in half that time - 30 minutes. When that renewal fails is when you know there is a problem. If your hotspot issues leases for 24 hours, a client won't try and renew for a long time. Checking the IP is good when you first connect but not much use later on. Jim VK7JH MMedit MMBasic Help |
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| Dinosaur Guru Joined: 12/08/2011 Location: AustraliaPosts: 311 |
Hi All Thanks for your patience Jim. Sometime I can't see the wood for the trees. In one of the earlier posts it was mentioned that some of the Wifi commands needed a connection before they would work. That discouraged me, and I started thinking of more complicated solutions. MISTAKE, think of simpler solutions. So, going over your earlier posts again, on MM.INFO(Wifi Status) decided to try. Lo and behold that does work. It returns -3 if the Hotspot is down and +1 when it is connected. One again many thanks for your assistance, I am learning along the way. PS: I normally edit the password to "*******" but forgot that time, although I am not connecting to the Internet. Regards Hervey Bay Qld. |
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| Dinosaur Guru Joined: 12/08/2011 Location: AustraliaPosts: 311 |
Hi All Am I correct in my testing, that when the "OPTION WIFI SSID$, PassWd$" fails after power down there is no way to establish a connection once you are in your program ? If I establish the Hotspot after the program has started, then the WIFI Status is always < 0 Regards Hervey Bay Qld. |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2135 |
On WebMite 5.07.08RC21 all I can see is to keep looking for the address until there is a response then use CPU RESTART. It then connects. Eg. Do While MM.Info(IP ADDRESS)<>"192.168.1.101" Pause 1000 Loop CPU restart As long as all important data is is saved to a file (or VAR SAVE) first it can be recovered after the re-boot. Edit Perhaps you need WEB SCAN, not MM.Info(IP ADDRESS) Not Tested Some experimenting will be needed. Edited 2023-11-26 13:22 by phil99 |
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| Dinosaur Guru Joined: 12/08/2011 Location: AustraliaPosts: 311 |
Hi All Good call Phil. I had already tested WEB SCAN and once the SSID was visible, tried a number of ways to connect. WEB MQTT CONNECT replies with "Wifi not connected" And just for the fun of it WEB TCP CLIENT REQUEST with the same result. Didn't dawn on me to activate a Restart. Now each time I do a recalc of A/H I check WEB SCAN. IF my SSID is visible, then set a flag to do a reboot next time I save my Value. If MM.INFO(Wifi Status) > 0 Then WifiConnect Else DIM a%(1024) web scan a%() longstring print a%() if linstr(a%(),"Rpi-Hotspot") then BootFlag = 1 EndIf Seems a bit archaic to have to do it this way. Where does one post feature requests for MMEdit ? Edited 2023-11-26 14:35 by Dinosaur Regards Hervey Bay Qld. |
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| Dinosaur Guru Joined: 12/08/2011 Location: AustraliaPosts: 311 |
Hi All All good now. Have also "overcome" the problem of not connecting every second boot. The only way I get repeatability is to use WEB SCAN in combination with MM.INFO(IP ADDRESS). DIM A%(1024) So whatever was holding the IP address, is being cleared by WEB SCAN.web scan a%() 'see if SSID has popped up longstring print a%() if linstr(a%(),"Rpi-Hotspot") then If MM.INFO(IP ADDRESS) = "0.0.0.0" Then Print "Step 0 IP ";MM.INFO(IP Address) Print "Step 0 Reboot" CPU RESTART EndIF EndIF  Regards Hervey Bay Qld. |
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