Hi zliudr,

I believe the documentation is correct. In the C language, "strings" are null byte terminated. So the hostname parameter is 32 bytes including the null byte.

Feel free to post any follow-up questions.

Jan

Hello,

the header file is here: https://github.com/espressif/esp-mqtt/blob/master/include/mqtt_client.h and can be found in your IDF instalation in this location: {$IDF_PATH}/components/mqtt/esp-mqtt/include/mqtt_client.h

Please also take a look at this API reference to check your error codes ...

Hi BergLoewe,
are you looking for the API reference?
https://docs.espressif.com/projects/esp ... index.html
Be sure to select your IDF version and chip in the lower left corner.

Jan

Hi John,

you can use any webhosting/filehosting service that offers a direct link to the file (so no page with a download button).

It may be possible to do this using dropbox by using a direct link. However, dropbox will redirect you to the actual file which may not work with the OTA updates. Also ...

Hi Derf Jagged,
the extra packets may be controller status information (like the state of charge, firmware version, signal strength, etc.)

I wasn't able to find much information on the Bluetooth protocol, but this page has information about the proprietary wireless communication protocol https ...

Hi Arnie,

this looks as though you cloned the esp-idf repository and missed the --recursive option.
To fix this, run the following command inside your esp-idf directory. Jan

Hi zliudr,

be sure to check the documentation on the build system, mainly the example project to get to know how the components work in the build system.

Jan

Hi DutchOrange,
this may be due to:

• use of the wrong serial port
• another program using the serial port
• bad USB connection or cable
• the USB device resetting

Please verify you are using the correct COM port.
If that doesn't help, then try a different USB port and/or another USB cable.

Jan

Hi os3n6c,
based on the specifications the MG811 sensor requires 6.0V ± 0.1V @200mA for its operation.

You will need to have a 6V power supply for this sensor or a voltage regulator.

Feel free to post any follow-up questions

Jan

Hi alsaleem00,

ESP32 does not support hardware acceleration for double precision floating point arithmetic (double). Instead double is implemented via software hence the behavioral restrictions with regards to float do not apply to double. Note that due to the lack of hardware acceleration, double ...