RAK4260 LPWAN Breakout Module connects with ESP8266

Hi
I just have got a RAK4260 LPWAN Breakout Module. Here I have no a J-Flash tool to flash the latest firmware. I think there should be a default firmware already in the RAK4260 LPWAN Breakout module, maybe it is the latest one. I think that the RAK4260 LPWAN Breakout module can run with the default firmware.
Then, I connect the RAK4260 LPWAN Breakout module with a ESP8266 using a serial passthrough program in order to communicate with the RAK4260 LPWAN Breakout module via its serial communication.
(TX/RX).

I can see the output and send the data (1) as shown in the following figure.

I think I should see like the following figure.

.

With the RAK Serial Port tool, it does not show any message from the RAK4260 LPWAN Breakout module.

This should get the same result like I got from the Arduino serial monitor.

My question is that “Do I have to to flash the firmware at the beginning?”. Just wonder if so, I have to get a J-Flash tool to do that.

It seems that the RAK4260 LPWAN Breakout module does not have AT commands to communicate with ESP8266 or ESP32 development boards because I have not found any AT command in the document. Am I right? If so, I misunderstood about this module. This works also different from the RAK811 LPWAN Evaluation Board that has its AT commands.

Dear,

Please refer this:https://doc.rakwireless.com/rak4260-lpwan-breakout-module/ttn-otaa-mode

RAK4260 is different from RAK811,And it not support AT command!