MKS Robin Nano v3.1 and MKS Wifi showing no responses

[cuthulino]

Hallo and sorry for the maybe dumb question.
I am completely stuck.

I got a fresh MKS Robin Nano v3.1 and a MKS Wifi Module.

Followed their manual and the ESP3D docs to flash the Wifi Module and everything worked fine.
I can access the WebUI and control my printer but I get no feedback.
No Temps are reported and no matter which gcode I enter, the only answer is "ok".

Checking Endstops with M119 results in ok.
Doing the same over USB responses with the states.

In ESP3D I defined the following (like mks tells us in the docs):

#define COMMUNICATION_PROTOCOL MKS_SERIAL

In Marlin everything is enabled like documented here and here:

   #define MOTHERBOARD BOARD_MKS_ROBIN_NANO_V3_1
   #define SERIAL_PORT -1 // for communication with USB
   #define TFT_LVGL_UI // for MKS TS35 display
   #define TOUCH_SCREEN // for MKS TS35 touch

   #define MKS_WIFI_MODULE

The only command returning more than ok is M115:

M115
ok
FIRMWARE_NAME:Robin_nano

But its returning less than usual...

I am missing something?
Or I am lucky and got a faulty Mainboard / Wifi Module?

[cuthulino]

wtf, entering M115 via usb returns a different firmware.
I am communicating with the wrong chip anyhow?

20:11:39.717 : N15 M115*18
20:11:39.719 : FIRMWARE_NAME:Marlin 2.1.2.5 (Jan 15 2025 17:30:57) SOURCE_CODE_URL:github.com/MarlinFirmware/Marlin PROTOCOL_VERSION:1.0 MACHINE_TYPE:Prusa I3 Rework custom Mod EXTRUDER_COUNT:1 UUID:cede2a2f-41a2-4748-9b12-c55c62f367ff
....

Edit:
Next step using a ftdi usb board to check signals.
RX1 and TX1 of the Robin do not communicate more than the ESP3D shows.
So I would say ESP is working like expected. But why I am not getting any readings / return values on that USART1 Ports?

[luc-github]

So I would say ESP is working like expected

Yes it is, it follow MKS specs

The MKS protocol is not a full serial bridge - it allow only M105 and M114 response and a couple of others command that make command M503 or M119 not responding.
please check #620

MKS protocol allows good file transfert speed but few responses, on others hand all commands are transfered from ESP3D->Marlin, but few responses are transfered from Marlin ->ESP3D, also this protocol is only working if you have MKS code using the lvgl UI

That is why I have on my todo list : #575

[cuthulino]

Thanks for you reply.
That is a rly strange decision of MKS.

I am intetested on temperature readings and starting a print over the webui. Is it possible to simply switch to raw communication when i disable MKS_WIFI_MODULE, enable serial on usart1 and change protocol in esp3d to raw?

[cuthulino]

that is working with MKS protocol

Ok. I am sure sth is wrong on my site.
I missed sth.

Opening the UI just tells me "waiting for temp list"

Manually sending a M105 works and temps are reported.
Setting auto reporting with M155 S4 just gets an "ok" and nothing is send.

For that you need to reflash Marlin and also ESP3D, but doing that you will loose the file upload feature because it is handled by MKS protocol

I can not even upload anything to SD.
Printing and Firmware Update from SD works fine.
Using M20 via the webui also returns the file list:

Begin file list
TEST~1.GCO 0
End file list
ok

Activating the setting SD - Show changes nothing.
I can only access Flash, no SD Card in Drop down.

[luc-github]

You need to go to webUI settings/inteface to activate the SD
for the temperatures and positions you must go to polling commands panel and enable it and what commands you want, https://esp3d.io/ESP3D-WebUI/Version_3.X/documentation/polling/ but not all will work due to mks filter

[cuthulino]

I already activated polling the temps:

Nothing changed. It doesn't get executed.

Same with SD Card:

Only Flash is visible. Already tried different cards (all working for printing)

[cuthulino]

Damn.
Hit me, hit me hard...

There is a save button on the bottom of the settings...
Thanks for your responses.... Shame on me!

[luc-github]

Hit me, hit me hard...

I can't you are too far away 😸