Over-The-Air(OTA) Network Upgrader


This architecture-agnostic component adds support for Over-The-Air upgrades.


  1. Add COMPONENT_DEPENDS += Ota to your application componenent.mk file.

  2. Add these lines to your application:

    #include <Ota/Manager.h>

After that you will have access to a global OtaManager instance that can be used to manage your OTA upgrade process.

  1. You can use OtaManager to get information about the bootable partitions and update them. The code below will display the current bootable and running partition:

    void init()
        // ...
        auto partition = OtaManager.getRunningPartition();
        Serial.printf("\r\nCurrently running %s @ 0x%08x.\r\n", partition.name().c_str(), partition.address());
  2. If needed you can also create your own instance of the of OtaUpgrader as shown below:

    // Call when IP address has been obtained
    void onIp(IpAddress ip, IpAddress mask, IpAddress gateway)
       // ...
       OtaUpgrader ota;
       auto partition = ota.getNextBootPartition();
       // ... write all the data to the partition
       // ...

See the Basic Ota sample application.

API Documentation

namespace Network


constexpr uint8_t NO_ROM_SWITCH = {0xff}

Magic value for ROM slot indicating slot won’t change after successful OTA.

class HttpUpgrader : protected HttpClient
#include <HttpUpgrader.h>

Public Functions

inline bool addItem(const String &firmwareFileUrl, Partition partition, ReadWriteStream *stream = nullptr)

Add an item to update.

  • firmwareFileUrl

  • partition – Target partition to write

  • stream

Return values:


inline void switchToRom(uint8_t romSlot)

On completion, switch to the given ROM slot.


romSlot – specify NO_ROM_SWITCH (the default) to cancel any previously set switch

inline void setBaseRequest(HttpRequest *request)

Sets the base request that can be used to pass.

   - default request parameters, like request headers...
   - default SSL options
   - default SSL fingeprints
   - default SSL client certificates



inline const ItemList &getItems() const

Allow read access to item list.

struct Item
#include <HttpUpgrader.h>
class ItemList : public Vector<Item>
#include <HttpUpgrader.h>


Used by

SoC support

  • esp32

  • esp32c2

  • esp32c3

  • esp32s2

  • esp32s3

  • esp8266

  • host