DISCO_L475VG_IOT01 WIFI HTTP SERVER example

Mbed OS
1

Hello,

I’m new to MED OS and I’m trying to get an example project running. My target is a DISCO_L475VG_IOT01. I am using Mbed Studio (latest version). I imported the DISCO_L475VG_IOT01 WIFI HTTP SERVER example and updated the mbed-os library to version 6.4.0. Finally, I updated the mbed_app.json file with the correct SSID and PASSWORD information.

The project compiles successfully. However, when I run the project I get the following console output when I attempt to connect to the HTTP server from a browser on my PC:

*** STM32 IoT Discovery kit for STM32L475 MCU ***
*** WIFI Web Server demonstration ***

*** Copy the IP address on another device connected ***
*** to the wifi network ***
*** Read the temperature and update the LED status ***

ES-WIFI Initialized.

es-wifi module MAC Address : C4:7F:51:7:58:F1
es-wifi module connected
es-wifi module got IP Address : 10.10.24.57
Start HTTP Server…
Wait for connection…
HTTP Server Started
ERROR : Cannot send web page

I believe the error is occurring on line 243 in main.cpp.

I apologize in advance if this is caused my a silly error on my part. Any suggestions would be greatly appreciated.

Regards,

Tom

2

Hello Tom,

Just for sure, it is good to test any example in its original state before you update MbedOS to its latest version. Always is a chance there are significant changes in the Mbed library or in HALs (what are included in the Mbed library).

First what I see is on the line 233

sprintf((char *)temp, "%f", temperature);

MbedOS6+ has float type disabled for print functions. However you can enabled it again, see - minimal_printf.

The code on the line 243 of main.cpp only evaluates status from method WIFI_SendData from line 241. So, if you not see any result in your web browser the issue can be with that medtod.

BR, Jan

3

Jan,

Thanks for taking the time to look at this issue. I did try to use the original state when I imported the project. However, there was an issue with python scripts not executing properly related to the print command. I believe it was an issue related to Python V2 versus Python V3. When I upgraded MBed-OS to the latest version, all compiled correctly except for one issue. The Serial object was not found (line 35 of main.cpp). I just commented out the object declaration and reference in the code so to use the default serial port settings. All compiled well once I did this.

The line of code where the error is occurring is as follows:

ret = WIFI_SendData(0, (uint8_t *)http, strlen((char *)http), &SentDataLength, WIFI_WRITE_TIMEOUT);

I apologize, this is line 241 (not 243) in the main.cpp file. For some reason, the the WIFI_SendData() is returning an error. I am having some difficulties with the debugger in getting into the details. I plan to look more at this issue tomorrow.

Again, thanks for your help and any suggestions you might have,

Regards,

Tom

4

Hi Tom,

ok, I tried to import it. The problem with the original state is the version of MbedOS. The example run on MbedOS 5.5 which is not supported by MbedStudio, it supports MbedOS5.12+.
So in the original state can be tested only with online compiler.

The serial object it was only for set baud rate of debug console probably.
Fo the MbedOS6+ you can do same with change from the Serial to BufferedSerial. Or you can change it in mbed_app.json file.

{
    "target_overrides": {
        "*": {
            "platform.stdio-baud-rate": 115200
        }
    }
}

The reason why the example was not updated can be, the Mbed has own implementation for the Wi-Fi.

BR, Jan

1 Like
5

Jan,

Thanks for your assistance with this issue. I am putting aside this matter as I am not able to get the MbedOS 6.4 WiFi example to run. I cannot find the necessary ISM43362-M3G-L44 drivers to support the MbedOS 6.4 WiFi library.

Regards,

Tom

6

Hello Tom,

some informations about setting and driver are on the github

BR, Jan