KC868-A2 SIM7600 with Tuya GPRS not work

[admin]

we are under testing, will release new firmware to fix it.

[alexps70]

Мне нужно, чтобы Tuya работала через Ethernet (он кстати не выключается) и при его недоступности переключалась на GPRS как на резервный канал связи. Такое можно реализовать? Либо управление Tuya работает через GPRS, но остальные протоколы (WEB/MQTT/HTTP и т.п.) работают через LAN

I need Tuya to work through Ethernet (by the way it does not turn off) and with its inaccessibility switched to GPRS as a reserve communication channel. Can this be realized? Or Tuya management operates through GPRS, but the rest of the protocols (Web/Mqtt/Http, etc.) work through LAN
Переведено с Google (Russian → English)

[admin]

you can set tuya use by ethernet or 4G. But only one way, can't auto switch to GPRS when ethernet is disconnected.

[alexps70]

Усли я активирую опцию GPRS - Tuya не работает, даже если полностью отключить кабель Ethernet - как я понимаю, этот баг будет исправлен.
Но я спрашиваю о втором моменте - если активирована опция GPRS для работы Tuya, будет ли работать управление по LAN по другим протоколам?

I activate the GPRS option - Tuya does not work, even if you completely turn off the Ethernet cable - as I understand it, this bug will be fixed.
But I ask about the second moment - if the GPRS option is activated for Tuya, will there be a LAN control for other protocols?
Переведено с Google (Russian → English)

[admin]

yes, you are right, only GRPS with tuya, other protocols work with ethernet.

[alexps70]

Хорошо, жду, когда работа Tuya через GPRS будет исправлена

Okay, I'm waiting for the work of Tuya through GPRS will be fixed
Переведено с Google (Russian → English)

[panarosa]

I have followed the documentation available on your website, but some of the links provided are either unavailable or no longer functional.
I have tested two different SIM7600E modules, and neither shows any sign of operation: they do not respond to AT commands and do not register on the network.
My goal was to integrate the KC868-A2 into a patented project with potential industrial application. I was convinced that your product could simplify my solution, but to date, I have not been able to use it.
I kindly request:

1. An updated step-by-step guide for configuring and testing the KC868-A2 with Arduino IDE.
   
2. Working links for downloading drivers, libraries, and example sketches.
   
3. Any specific instructions for verifying the proper functionality of the SIM7600E module.
   

If we can find a solution, it will be mutually beneficial. Otherwise, I will be forced to abandon the use of this module.
Technical Tests Already Performed on KC868-A2 with SIM7600E

1. Development Environment Setup
   • Arduino IDE (tested with both version 1.x and 2.x)
     
   • Official ESP32 core installed via URL:
     
     
     Code:

     https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
     
     
   • Selected board: ESP32 Dev Module
     
   • Baud rate set to 115200
     
2. Sketch Upload
   • Tested official KinCony sketches for KC868-A2 with SIM7600
     
   • Tested custom sketches for sending AT commands
     
   • Tested with PSRAM disabled to eliminate
     
     Code:

     PSRAM ID read error
     
     
   • Compilation and upload completed successfully → ESP32 is working correctly
     
3. Connections and Power Supply
   • KC868-A2 powered with 12V as per manual
     
   • LTE antenna connected to MAIN port of SIM7600 (not AUX/GNSS)
     
   • Verified presence of power and indicator LEDs:
     • Red power LED solid on
       
     • Green modem LED blinking continuously
       
4. SIM Cards
   • Tested two different SIM cards in two different SIM7600E modules → no response
     
   • SIM cards confirmed working in a mobile phone
     
   • SIM PIN disabled
     
   • Contacts cleaned
     
   • Correct insertion verified
     
5. AT Command Tests from ESP32
   • Code:

     AT
     ,
     
     Code:

     AT+CPIN?
     ,
     
     Code:

     AT+CSQ
     ,
     
     Code:

     AT+CREG?
     → no response
     
   • Serial Monitor shows nothing or “modem not found”
     
6. Alternative Checks
   • Attempted direct connection via USB MODEM to PC (drivers not easily available)
     
   • Tried alternative SIM slots and different LTE antennas
     
   • Evaluated alternative GSM modules (SIM800C, SIM800L) → working in other projects
     

---

Conclusion:
The ESP32 works and communicates correctly via USB, but the SIM7600E module does not respond to any AT command, even after testing with two different units, proper power supply, and a suitable LTE antenna.

[admin]

take a photo , how you connect with 4G module, what power supply you are using?

[alexps70]

we are under testing, will release new firmware to fix it.

When is a decision expected?