Converting a sketch from 1.5.x to 2.0.x

  • Admin

    2.0.x allow configuration (old MyConfig stuff) to be done directly in the sketch using simple c #defines. You can still make modification in MyConfig if you want to override the default values once and for all.

    It is important to do these defines before including MySensors.h, otherwise they will go unnoticed when the library evaluates which parts to include.

    The most common thing you need to do is to decide which radio to use (or not to use). We currently support three different transport layers. Only activate ONE transport per node.

    // Activate one of these
    #define MY_RADIO_NRF24
    #define MY_RADIO_RFM69
    #define MY_RS485

    In addition to the transport you can also allow the node to be a gateway (communicating to the controller). We currently offer a few variants here as well. Note that ESP8266 is always considered to be a gateway node (but it can still communicate with a sub-network of none-esp sensor nodes). If you want to enable gateway functionality enable one of these:

    // Enable serial gateway
    // Enable gateway ethernet for a ENC28J60 module 
    #define MY_GATEWAY_ENC28J60
    // Enable gateway for a W5100 ethernet module 
    #define MY_GATEWAY_W5100
    // Enable gateway for a ENC28J60 ethernet for a  module 
    #define MY_GATEWAY_ENC28J60
    // Enable a MQTT client gateway for W5100 or ESP node

    Each type of gateway has additional configuration available (ip settings etc). Please look at the prepared example for more details.

    To upgrade a sketch old 1.5 sketch to 2.0 there is just a few steps to go through.

    • Remove the MySensors gw; class initialization and gw.begin()-call. It's no longer needed. Use #defines to set radio channels or other settings. They are all documented in MyConfig.h.

    • The library now calls process() automatically. So you must remove it from you main loop().

    • Remove the gw. part before any library call. It's no longer needed as library functions is available in the main scoop. For instance gw.send(msg) should just be send(msg).

    • The controller can now re-request presentation information from a node. This means we have to move all node presentation to a new special function presentation() {}. This will be called at node startup or when controller requests a new presentation.

    So if your old node had this:

    void setup()  
      gw.sendSketchInfo("Distance Sensor", "1.0");
      gw.present(CHILD_ID, S_DISTANCE);

    Do like this instead:

    void presentation()  
      sendSketchInfo("Distance Sensor", "1.0");
      present(CHILD_ID, S_DISTANCE);

    If you need to do initialization before the MySensors library starts up, define a

    void before() {
        // This will execute before MySensors starts up

    You can still use setup() which is executed AFTER mysensors has been initialised.

    void setup() {

    To handle received messages, define the following function in your sketch

    void receive(const MyMessage &message) {
        // Handle incoming message

    If your node requests time using requestTime(). The following function is used to pick up the response.

    void receiveTime(unsigned long ts) {

    Here follows a small sample of the defines you can use in your sketch

    #define MY_DEBUG    // Enables debug messages in the serial log
    #define MY_REPEATER_FEATURE  // Enables repeater functionality for a radio node
    #define MY_BAUD_RATE  9600 // Sets the serial baud rate for console and serial gateway
    #define MY_NODE_ID 42 // Sets a static id for a node
    #define MY_PARENT_NODE_ID xx // Sets a static parent node id
    #define MY_OTA_FIRMWARE_FEATURE  // Enables OTA firmware updates
    #define MY_RF24_CE_PIN 9    // Radio specific settings for RF24
    #define MY_RF24_CS_PIN 10 // Radio specific settings for RF24 (you'll find similar config for RFM69)
    #define MY_INCLUSION_MODE_FEATURE // Enables inclusion mode (for a gateway)
    #define MY_INCLUSION_BUTTON_FEATURE // Eables inclusion mode button (for a gateway)
    #define MY_LEDS_BLINKING_FEATURE // Enables transmission led feature for a node or gateway
    #define MY_SIGNING_ATSHA204 // Enables hardware signing using ATSHA204
    #define MY_SIGNING_SOFT // Enables software signing

    Security related settings (HMAC and AES keys among other things) are now configured using the SecurityPersonalizer sketch. Secrets are stored in eeprom for all software based security features (including rfm69 encryption).

    There are many more things you can tweak using defines and we've tried to include most of them in relevant examples. The MyConfig.h/keywords.txt shows you the full list of defines available.

  • Hi,

    How does this work when your gateway also have local sensors? I tried to merge the Humidity sensor (DHT11) with the SerialGateway but it seems that presentation is not called after uploading the sketch. This is what I have:

    void setup() { 
      // Setup locally attached sensors
      metric = getConfig().isMetric;
    void presentation() {
     // Present locally attached sensors 
     sendSketchInfo("My Gateway", "1.0");
     present(CHILD_ID_HUM, S_HUM);
     present(CHILD_ID_TEMP, S_TEMP);

    And the output is:

    0;255;3;0;14;Gateway startup complete.
    0;255;3;0;9;No registration required
    0;255;3;0;9;Init complete, id=0, parent=0, distance=0, registration=1

    If I put the "present" lines at the setup() then I got the expected lines:

    0;255;3;0;14;Gateway startup complete.
    0;255;3;0;11;My Gateway
    0;255;3;0;9;No registration required
    0;255;3;0;9;Init complete, id=0, parent=0, distance=0, registration=1

    Is this expected or I missed something? I'm trying to use this gateway with homeassistant and it seems that homeassistant expect those presentation lines. There's a issue with the use of node "0" id too, but i should leave it to another topic.

  • Maybe related to this problem?

    My gateway does the same. No presentation, but sending data.

  • The API looks very clean and simple, I look forward to use it more.
    Does Arduino/MySensors uses C++ features (namespaces?) to prevent name collision? In typical C projects I've seen the functions all beginning with some prefix (mysensors_).

  • @rollercontainer Where should the "if (presentation).." be? At the setup()?

  • Mod

    @chrlyra there is no such thing as if(presentation)...
    The presentation function implementation can be anywhere in your sketch.

  • @Yveaux rollercontainer pointed to this issue:, where hek asked him to add two lines of code, the first one being "if (presentation)".

  • Mod

    @chrlyra That's what happens if you deviate from the topic... Anyway, thanks for the hint!

  • Great work ! This version looks a lot cleaner and the support for the RFM69 is more integrated. Thanks for that. One thing I'm missing and that's the specification of the encryption key for the RFM69. This was done in version 1.5.x by a user defined 16 bytes string. Now i see only a #define MY_RFM69_ENABLE_ENCRYPTION.
    How and where is the key specified ? How does this make my setup unique ?


  • Hardware Contributor

    If I remember well, it is handled by SecurityPersonalizer.ino It is sketch for signing options, and i think you can set/generate your rf aes key there. It store it in eeprom. Then you upload the new sketch with encryption define enabled. For me it's ok, as i use signing which needs to use the personalizer.
    I think this works like this, not sure as i have not enabled encryption yet. Am I right @Anticimex ?

  • Contest Winner

    @scalz is correct. Details are in the doxygen documentation for usage. Link is on the GitHub readme. Look under the signing module there.

  • @Anticimex
    Thanks, I got it working. By setting it to "soft" this sketch writes all key's to eeprom and will not look for a hardware siging module. The RFM69 uses the EAS key for encryption. I defined my own key again in the sketch.
    Nice solution !

  • Contest Winner

    @Rolo6442u precisely. Glad to hear that the docs are helping 🙂 and thanks!

  • How can i call the process() inside a while in the loop() ?


  • @pascalgauthier

    I think the function "wait()" might be useful. It is like a sleep, but now it calls "process()"

  • @nielsokker said:


    I think the function "wait()" might be useful. It is like a sleep, but now it calls "process()"

    I was thinking of using it with wait(0) but I was wondering if there was any way to call the process directly.

  • @pascalgauthier

    I'm not sure. I think the developers will know.

  • Hardware Contributor

    @pascalgauthier why do you need to call process ? It's already done internally by the lib. Or is it for inside some longtime loop? you still can use process but now it's _process()
    Wait is not the same as sleep.
    Wait : wait for a time and call _process
    sleep: does not call _process. it sleeps. for a time if set

  • @scalz
    Because i have while() that increment motion detected in a 30sec timeframe. And i would like to be sure that i'm not missing any cmd from the gateway. Do i need to define any additional library to use the _process() ?

  • Hero Member

    @pascalgauthier I would recommend making your while loop non-blocking i.s.o. hacking into a MySensors function.

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