MCP2515 mcp2515(&spi);

[AnatoliyChel]

Could you please explain what is spi means in this code? It has a type spi_device_handle_t and i can't find any description of this. Please give example.

[GiovanniRaseraF]

You need to set up the spi structure If you want i created a fork to do it here: https://github.com/GiovanniRaseraF/esp32-SIM800-mcp2515

You can find the setup and use it if you want,

[GiovanniRaseraF]

In my case i had to set this parameters:

define MISO 19

define MOSI 23

define SCK 18

define SS 5

[GiovanniRaseraF]

I also modified the code for the MCP2515 constructor like this:

MCP2515::MCP2515(spi_device_handle_t *s)
{
    spi = s;
    // ESP32SIM800 START
    esp_err_t ret;
    spi_bus_config_t buscfg={};
    buscfg.miso_io_num=MISO;
    buscfg.mosi_io_num=MOSI;
    buscfg.sclk_io_num=SCK;
    buscfg.quadwp_io_num=-1;
    buscfg.quadhd_io_num=-1;  

    spi_device_interface_config_t devcfg={};

    devcfg.clock_speed_hz=1*1000*1000,               //Clock out at 1 MHz
    devcfg.mode=0,                                   
    devcfg.spics_io_num=SS,                          //Chip select
    devcfg.queue_size=7,

    //Initialize the SPI bus
    ret=spi_bus_initialize(HSPI_HOST, &buscfg, 1);
    assert(ret==ESP_OK);
    //Attach the MCP2515 to the SPI bus
    ret=spi_bus_add_device(HSPI_HOST, &devcfg, &*spi);
    assert(ret==ESP_OK);
    // ESP32SIM800 END 
}

Its not a good solution but i dont want to set spi parameters in void setup();