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[GH-ISSUE #524] Connection problem S3 to C6 #3094
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Reference: starred/OpenEPaperLink#3094
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Originally created by @hacki033 on GitHub (Nov 10, 2025).
Original GitHub issue: https://github.com/OpenEPaperLink/OpenEPaperLink/issues/524
Hello,
I flashed Yellow AP via https://install.openepaperlink.de/ for the S3 and then the C6.
I also tried connecting the C6 separately via USB. I also flashed the C6 with esptool.
But there seems to be no connection between the two boards.
Is there any way I can check if they are communicating correctly?
@hacki033 commented on GitHub (Nov 11, 2025):
@hacki033 commented on GitHub (Nov 11, 2025):
I was able to flash the C6 by connecting GPIO9 to the ESP32's chassis during the flashing process.
Now, I only have one problem on the Access Point overview at 192.168.178...: in the upper right corner, I see a "! failed" message. That shouldn't be there. What do I need to change?
@hacki033 commented on GitHub (Nov 11, 2025):
23:31:03.119 -> ESP-ROM:esp32s3-20210327
23:31:03.152 -> Build:Mar 27 2021
23:31:03.152 -> rst:0x1 (POWERON),boot:0x8 (SPI_FAST_FLASH_BOOT)
23:31:03.152 -> SPIWP:0xee
23:31:03.152 -> mode:DIO, clock div:1
23:31:03.152 -> load:0x3fce3808,len:0x44c
23:31:03.152 -> load:0x403c9700,len:0xbd8
23:31:03.152 -> load:0x403cc700,len:0x2a80
23:31:03.152 -> entry 0x403c98d0
23:31:03.538 -> >
23:31:05.128 -> [WiFi-event 0]
23:31:05.161 -> [WiFi-event 2]
23:31:05.161 -> ssid: ***********
23:31:05.197 -> [WiFi-event 3]
23:31:05.419 -> [WiFi-event 0]
23:31:05.419 -> [WiFi-event 2]
23:31:05.419 -> Connecting to WiFi...
23:31:07.971 -> [WiFi-event 5]
23:31:07.971 -> WiFi lost connection. Reason: 203
23:31:08.035 -> [WiFi-event 4] Connected to access point
23:31:08.068 -> [WiFi-event 7] Obtained IP address: 192.168.178.****
23:31:08.261 -> Connected!
23:31:08.519 -> reading DB from /current/tagDB.json
23:31:08.778 -> loadDB took 240ms
23:31:08.778 -> Cleaning up temporary files
23:31:09.712 -> rxSerialTask starting
23:31:11.065 -> pingtime succesfully synced
23:31:11.549 -> Free heap: 187500 allocatable: 172020 stack: 13348
23:31:11.646 -> failed
23:31:11.646 -> Resetting tag
23:31:12.030 -> DB saved 479ms
23:31:12.096 -> <ADR 0000607D09D9B4DC
23:31:13.190 -> ping failed
23:31:14.095 -> ping failed
23:31:14.999 -> ping failed
23:31:15.903 -> ping failed
23:31:16.805 -> ping failed
....
This is the log from the S3 with connected C6
S3 >> C6
17 2 GPIO
18 3 GPIO
19 TX GPIO
20 RX GPIO
21 9 GPIO
47 RST GPIO
GND
3,3V ( also try 5V)
Access Point Page
i use it on linux with google chrome browser also tried firefox
@AlBundy00 commented on GitHub (Nov 13, 2025):
I have similar problem and no idea what I can do or check. All flashing went fine.
Any idea what's going on?
@hacki033 commented on GitHub (Nov 23, 2025):
No one can help?
@hacki033 commented on GitHub (Dec 11, 2025):
@AlBundy00 did you solve the problem?
Could someone please give me a tip on what else I can do?
What other logs or information do I need?
pls Thanks in advance.
@AlBundy00 commented on GitHub (Dec 11, 2025):
I did not solve it. I was at a friend and we flashed an access point and it worked. I went home and reflashed (because of another WLAN) and what should I say: It came again up with just "Failed to come online ;-("
No hints why. After that I lost interest. Now lying around in a corner. There are other things to have fun with... ;-)
@Zippochonda commented on GitHub (Jan 22, 2026):
I have the same Problem and dont know what to do, C6 flashing says sucess, but no AP online.