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Forum Index : Microcontroller and PC projects : ESP8266 on CMM2 or "you can't ping the www.backshed.com"
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andreas Senior Member  Joined: 07/12/2020 Location: GermanyPosts: 187 |
Hello, I wanted to connect the Colour Maximite 2 to the internet. My setup is an ESP8266 chip connected to ports 4,6,8,10 of the CMM2. Pin 8 & 10 are for TX/RX of com1: and pin 4 & 6 for VCC and GND. In between I put a dc-dc converter which generates 3.3 volts for the esp from the 5 volts comming from the cmm2. the TX/RX are connected cross over ("null modem") TX Cmm2 to RX ESP and vice versa. The ESP chip enable pin is sourced from the 3.3V comming from the buckboost converter.   a tiny "terminal program" gives the possibility to key in ESP8266_AT commands to test all the features: ' terminal.bas - terminal program to interface with esp8266 ' cls print "ESP Terminal on COM1" print "====================" open "com1:115200" AS #1 open "terminal.log" FOR APPEND AS #2 do eingabe$ = "" ausgabe$ = "" eingabe$ = inkey$ if eingabe$ <> "" then print #1,UCASE$(eingabe$); end if if Loc(#1) >=1 then ausgabe$ = input$(1,#1) char = ASC(ausgabe$) if char > 31 then print ausgabe$; print #2, ausgabe$; end if if char = 13 then print #2, "" end if loop And this is the result: OK AT+RESTORE OK ets Jan 8 2013,rst cause:2, boot mode:(3,7) load 0x40100000, len 1856, room 16 tail 0 chksum 0x63 load 0x3ffe8000, len 776, room 8 tail 0 chksum 0x02 load 0x3ffe8310, len 552, room 8 tail 0 chksum 0x79 csum 0x79 2nd boot version : 1.5 SPI Speed : 40MHz SPI Mode : DIO SPI Flash Size & Map: 8Mbit(512KB+512KB) jump to run user1 @ 1000 ??o?s?n|??|rl?s?l?l?l`?s?dl?l`?r?l???ll`sl?rd???cd?cr|bp`lcls?dco?nn?lpl?l?????ll?o???bl?p???cl?cpslrl Ai-Thinker Technology Co. Ltd. ready AT+CWMODE=1 OK AT+CWLAP +CWLAP:(3,"WLAN-E6A414",-81,"9c:80:df:e6:a4:c4",7,0,0) +CWLAP:(3,"hurz",-57,"98:9b:cb:2e:00:ec",12,11,0) +CWLAP:(3,"TEST",-55,"9a:9b:cb:2e:00:ec",12,11,0) OK AT+CIFSR +CIFSR:STAIP,"0.0.0.0" +CIFSR:STAMAC,"c8:c9:a3:64:ef:2b" OK AT+CWJAP_DEF="TEST","SOMEPASSWD" WIFI CONNECTED WIFI GOT IP OK AT+CWAUTOCONN=1 OK AT+CIPSTATUS STATUS:2 OK AT+CIPDOMAIN="WWW.THEBACKSHED.COM" +CIPDOMAIN:223.27.28.33 OK AT+PING="WWW.THEBACKSHED.COM" +timeout ERROR AT+PING="WWW.GOOGLE.COM" +13 OK AT+PING="WWW.THEBACKSHED.COM" +timeout ERROR so, the www.thebackshed.com is not pingable  sources: https://www.espressif.com/sites/default/files/4a-esp8266_at_instruction_set_en_v1.5.4_0.pdf - the at commands https://www.instructables.com/Using-the-ESP8266-module/ - inspiration for the terminal program -andreas |
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| JohnS Guru  Joined: 18/11/2011 Location: United KingdomPosts: 3655 |
Can't ping it from Linux either. But ping thebackshed.com works. John |
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| toml_12953 Guru Joined: 13/02/2015 Location: United StatesPosts: 326 |
That seems like a lot of work. Do you only have a 1st Gen CMM2? The 2nd Gen version has holes right on the main board to mount the ESP8266 (in my case a socket for it for easy replacement if necessary) |
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| andreas Senior Member Joined: 07/12/2020 Location: GermanyPosts: 187 |
Yes I'm using a 1st generation CMM2 build in november/december 2020 - at that time I've got the CoreH743I, STM32 STM32H743IIT6 MCU core board for 29  I was not aware of the ESP-01 wireless chip until I read in this forum about that. I started looking at amazon and found two parts - the chip itself and the "breadboard" adapter. When the chip arrives I had no information how to use it and looked for the handbook and sample code. the rest was a matter of two days. Now I'm playing with an #include library of code to use internet connections within MMBASIC. This can start with simple things like setup wifi connections, terminal software etc. up to an mail client or even a lynx like browser. -andreas |
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| ville56 Regular Member  Joined: 08/06/2022 Location: AustriaPosts: 68 |
Andreas, regarding your question "so, the www.thebackshed.com is not pingable": If the ICMP echo request is disabled on the IP route or the server itself, you will get no response to pings. This is a decision usually taken by the server or network admin, depending on configuration and/or security requirements. It is not uncommon to block ICMP echo. Regards, Gerald 73 de OE1HGA, Gerald |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9060 |
Gerald is spot-on. MOST sites allow for ping, just to aid in proving they are alive and reachable on the net, but some sites do block the ping command. Certainly not many, but TBS.COM must be one of those.  I can't ping it from here on W10 either. Smoke makes things work. When the smoke gets out, it stops! |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3013 |
The non-pingable IP address goes to thebackshed.com if entered into the browser. The pingable one says "Forbidden". Edited 2022-09-26 22:07 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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