ESP32-Mesh-OTA/components/mesh_ota/Mesh_OTA.c

#include "Mesh_OTA.h"

/*
 * 999.999.999
 * Return true if remote version is newer (higher) than local version
*/
bool bNewerVersion(const char* pu8Local, const  char* pu8Remote)
{
    char u8LocalTmp[12]; //local version
    char u8RemoteTmp[12]; //remote version
    char* pu8saveptrLocal; //context for strok_r
    char* pu8saveptrRemote; //context for strok_r
    bool bReturn = false; //flag to stop loop
    uint8_t u8Index = 0; //numbers counter in version string

    strcpy(u8LocalTmp, pu8Local); //copy in tmp
    strcpy(u8RemoteTmp, pu8Remote); //copy in tmp

    char* pu8TokenLocal = strtok_r(u8LocalTmp, ".", &pu8saveptrLocal); //split tokens
    char* pu8TokenRemote = strtok_r(u8RemoteTmp, ".", &pu8saveptrRemote); //split tokens

    while( (u8Index <= 2) && (bReturn == false)) //loop through tokens
    {
        u8Index++;
        if(atoi(pu8TokenLocal) < atoi(pu8TokenRemote))
        {
            bReturn = true; //version number difference --> stop loop
        }
        pu8TokenLocal = strtok_r(NULL, ".", &pu8saveptrLocal); //split tokens
        pu8TokenRemote = strtok_r(NULL, ".", &pu8saveptrRemote); //split tokens
    }
    return bReturn;
}

esp_err_t errFindImageStart(const char* pu8Data, uint32_t* pu32DataLenght, uint32_t* pu32StartOffset)
{
    /*
    Offset  value
    0      = 0xE9 (first byte in image --> magic byte)
    48     = first digit of version number
    */

    esp_err_t errReturn = ESP_OK;
    bool bImageStartOffsetFound = false;
    uint32_t u32DataIndex = 0;
    uint32_t u32FirstDotOffset = 0;
    uint32_t u32SecondDotOffset = 0;
    uint8_t u8FirstDotIndex = 0;
    uint8_t u8SecondDotIndex = 0;

    *pu32StartOffset = 0U; //reset offset to zero

    while((u32DataIndex < *pu32DataLenght) &&  (bImageStartOffsetFound == false))
    {
        //search for magic byte
        if(pu8Data[u32DataIndex] == 0xe9)
        {
            //magic byte found
            while ((u8FirstDotIndex < 3) && (u32FirstDotOffset == 0))
            {
                //search first dot in version number
                if((u32DataIndex+49+u8FirstDotIndex) < *pu32DataLenght)
                {
                    if((pu8Data[(u32DataIndex+49+u8FirstDotIndex)] == 0x2e))
                    {
                        //first dot found
                        u32FirstDotOffset = (u32DataIndex+49+u8FirstDotIndex);
                    }
                }
                u8FirstDotIndex++;
            }

            while ((u8SecondDotIndex < 3) && (u32SecondDotOffset == 0) && (u32FirstDotOffset != 0))
            {
                //search first dot in version number
                if((u32FirstDotOffset+(u8SecondDotIndex+2)) < *pu32DataLenght)
                {
                    if((pu8Data[(u32FirstDotOffset+(u8SecondDotIndex+2))] == 0x2e))
                    {
                        //second dot found
                        u32SecondDotOffset = (u32FirstDotOffset+(u8SecondDotIndex+2));
                    }
                }
                u8SecondDotIndex++;
            }

            if((u32FirstDotOffset != 0) && (u32SecondDotOffset != 0))
            {
                //image start found based on magic byte and version number systax
                *pu32StartOffset = u32DataIndex; //store image start offset
                bImageStartOffsetFound = true;
            }
            else
            {
                // this is propably not the magic byte --> reset
                u32FirstDotOffset = 0;
                u32SecondDotOffset = 0;
                u8FirstDotIndex = 0;
                u8SecondDotIndex = 0;
            }
        }
        u32DataIndex++;
    }

    if(bImageStartOffsetFound == false)
    {
        errReturn = ESP_ERR_NOT_FOUND;
    }

    return errReturn;
}

esp_err_t errExtractVersionNumber(const char* pu8Data, uint32_t* pu32DataLenght, char* pc8RemoteVersionNumber)
{
    uint32_t u32StartOffset;
    esp_err_t err = ESP_OK;

    strcpy(pc8RemoteVersionNumber, "999.999.999"); //init value
    err = errFindImageStart(pu8Data, pu32DataLenght, &u32StartOffset); //get image start offset

    if(err == ESP_OK)
    {
        //image found
        strncpy(pc8RemoteVersionNumber, pu8Data+(u32StartOffset+48), 11); //copy version number
        pc8RemoteVersionNumber[12] = '\0';
    }
    return err;
}

/*


esp_err_t esp_mesh_ota_send(mesh_addr_t* dest)
{
    esp_err_t err = ESP_OK;

    static uint32_t u32index;

    const esp_partition_t * currentPartition = esp_ota_get_boot_partition();

    if((*currentPartition).subtype == 0)
    {

        int data_read = 0;

        struct ota_mesh_packet packet;
        packet.type=OTA_Data;

        if(u32index == 1024)
        {
            //all data read
            data_read = 0;
            u32index = 0;
        }
        else
        {
            ESP_LOGI(MESH_TAG, "OTA-Data read: %i", u32index);
            err =  esp_partition_read(currentPartition, (1024*u32index), packet.au8Payload, 1024 );
            ESP_ERROR_CHECK(err);
            data_read = 1024;
            u32index++;
        }

        if (data_read > 0)
        {
            //send ota fragemnt to node
            esp_mesh_send_packet(dest, &packet);
        }

        ESP_ERROR_CHECK(err);
    }
    else
    {
        ESP_LOGI(MESH_TAG, "Subtype: %d",  (*currentPartition).subtype);
    }
    return err;
}

esp_err_t esp_mesh_ota_receive(mesh_addr_t* dest, struct ota_mesh_packet* packet)
{
    esp_err_t err = ESP_OK;
    static esp_ota_handle_t otaHandle;
    static uint32_t u32index;

    const esp_partition_t * currentPartition = esp_ota_get_boot_partition();
    const esp_partition_t * otaPartition =  esp_ota_get_next_update_partition(currentPartition);

    if(u32index == 0)
    {
        //first run

        err = esp_ota_begin(otaPartition, OTA_SIZE_UNKNOWN, &otaHandle);
        ESP_ERROR_CHECK(err);
    }

    ESP_LOGI(MESH_TAG, "OTA-Data write: %i", u32index);
    err = esp_ota_write(otaHandle, packet->au8Payload, 1024);

    if(err != ESP_OK)
    {
        ESP_LOGE(MESH_TAG, "OTA-Data write error: %i at %i", err, u32index);
    }

    ESP_ERROR_CHECK(err);



    if(u32index >= 1023)
    {
        //ota update complete

        ESP_LOGI(MESH_TAG, "OTA-Data complete arrived: %i", u32index);
        err = esp_ota_end(otaHandle);
        ESP_ERROR_CHECK(err);
        esp_app_desc_t otaPartitionDesc;
        err = esp_ota_get_partition_description(otaPartition, &otaPartitionDesc);
        ESP_ERROR_CHECK(err);
        ESP_LOGI(MESH_TAG, "otaPartition project_name: %s",  (otaPartitionDesc).project_name);

        err = esp_ota_set_boot_partition(otaPartition);
        ESP_ERROR_CHECK(err);

        struct ota_mesh_packet retPacket;
        retPacket.type=OTA_Complete;
        ESP_ERROR_CHECK (esp_mesh_send_packet(dest, &retPacket)); //send back to parent

        //check if this node has children --> Update them

        esp_restart();
    }

    u32index++;


    return err;
}
*/