Use the W5100 module instead (if you need ethernet)
Good idea, thanks! Same code, but only W5100 based:
Sketch uses 17190 bytes (...) Global variables use 853 bytes (41%)
Using W5500 ( Ethernet2.h ) gives even better:
Sketch uses 14712 bytes (...) Global variables use 809 bytes (39%)
If you don’t need ethernet, use usb or wifi since those options also use less ram.
I need some kind of 25m wire so options are ethernet, RS-485 or PJON
Answering one of my own questions.
On ethernet gateway send() may return true when there is no connected controller, even when there is no ethernet cable plugged in. 
@matkor said in How ethernet gateway code can check if is connected with controller?:
- Is any way to know if controller is connected ?
- Is any way to know if send message really reached controller?
Seems positive send() result means message reached controller when executed on gateway?
Having arduino ethernet gateway I need to send messages with senors values to controller (Home assistant requirement to auto configure sensors).
With serial gateway simple sending in first iteration of loop:
void loop() {
if ( ! inital_msgs_sent ) {
inputs.sendStates();
outputs.sendStates();
inital_msgs_sent = true;
worked.
But with ethernet controller loop starts when HA is not yet connected to GW so sent messages do not reach controller
So, how should I fix it?
TIA, regards,
@matkor said in How can one use MyMessage class in library?:
Switching both clashing functions ( wakeUp1(), wakeUp2() ) to static functions seems to fix linking for me.
This sees to be deadend as there come more function name clashes, and i suspect linking problems come from magic done by arduino IDE.
Current hack for me is include in arduino sketch my lib headers after including MySensors:
#include <MySensors.h>
#include <MyLib.h>
and than inside library use only:
#include <core/MySensorsCore.h>
not sure if its right solution, if one has any better please share.
Switching both clashing functions ( wakeUp1(), wakeUp2() ) to static functions seems to fix linking for me.
diff --git a/hal/architecture/AVR/MyHwAVR.cpp b/hal/architecture/AVR/MyHwAVR.cpp
index 5a17b063..a018ab35 100644
--- a/hal/architecture/AVR/MyHwAVR.cpp
+++ b/hal/architecture/AVR/MyHwAVR.cpp
@@ -41,7 +41,7 @@ volatile uint8_t _wakeUp2Interrupt =
static uint32_t sleepRemainingMs = 0ul;
-void wakeUp1(void)
+void static wakeUp1(void)
{
// Disable sleep. When an interrupt occurs after attachInterrupt,
// but before sleeping the CPU would not wake up.
@@ -53,7 +53,7 @@ void wakeUp1(void)
_wokeUpByInterrupt = _wakeUp1Interrupt;
}
}
-void wakeUp2(void)
+void static wakeUp2(void)
{
sleep_disable();
detachInterrupt(_wakeUp2Interrupt);
diff --git a/hal/architecture/NRF5/MyHwNRF5.cpp b/hal/architecture/NRF5/MyHwNRF5.cpp
index d91a0438..f083a17c 100644
--- a/hal/architecture/NRF5/MyHwNRF5.cpp
+++ b/hal/architecture/NRF5/MyHwNRF5.cpp
@@ -28,11 +28,11 @@ volatile uint8_t _wakeUp1Interrupt =
volatile uint8_t _wakeUp2Interrupt =
INVALID_INTERRUPT_NUM; // Interrupt number for wakeUp2-callback.
-void wakeUp1(void) // place to send the interrupts
+void static wakeUp1(void) // place to send the interrupts
{
_wokeUpByInterrupt = _wakeUp1Interrupt;
}
-void wakeUp2(void) // place to send the second interrupts
+void static wakeUp2(void) // place to send the second interrupts
{
_wokeUpByInterrupt = _wakeUp2Interrupt;
}
@tekka said in How can one use MyMessage class in library?:
#define MY_CORE_ONLY
It solved compiiation errors, but now I have link errors(I have many .cpp/.h files in my lib):
/tmp/arduino_build_899057/libraries/MyLib/Foo.cpp.o (symbol from plugin): In function `wakeUp1()':(.text+0x0): multiple definition of `wakeUp1()'
Seems same as https://forum.mysensors.org/topic/6084/including-mysensors-h-in-multiple-files .
I tried:
#include <core/MySensorsCore.h>
but it fails:
Alternatives for core/MyMessage.h: []In file included from mytest.ino:13:0:
ResolveLibrary(core/MyMessage.h)
-> candidates: []
MyLib/MyLib.h:10:10: fatal error: core/MyMessage.h: No such file or directory
#include <core/MyMessage.h>
^~~~~~~~~~~~~~~~~~
compilation terminated.
How can one use MyMessage class in library?
When I try to
#include <MySensors.h>
in my library code I get:
Arduino/libraries/MySensors/MySensors.h:426:2: error: #error No forward link or gateway feature activated. This means nowhere to send messages! Pretty pointless.
without include I of course get:
Button.h:13:5: error: 'MyMessage' does not name a type
MyMessage msg;
Use the W5100 module instead (if you need ethernet)
Good idea, thanks! Same code, but only W5100 based:
Sketch uses 17190 bytes (...) Global variables use 853 bytes (41%)
Using W5500 ( Ethernet2.h ) gives even better:
Sketch uses 14712 bytes (...) Global variables use 809 bytes (39%)
If you don’t need ethernet, use usb or wifi since those options also use less ram.
I need some kind of 25m wire so options are ethernet, RS-485 or PJON
I need only few binary sensors/switches (relays) controllable from HomeAssistant, so I hoped to add their simple logic to
https://github.com/mysensors/MySensorsArduinoExamples/blob/master/examples/GatewayENC28J60/GatewayENC28J60.ino
But building above already takes: Sketch uses 29276 bytes (...) Global variables use 1757 bytes
I tried to reduce SRAM usage, but disabling MY_DEBUG, MY_RADIO_RF24, MY_INCLUSION_* , MY_DEFAULT_* reduces sizes to
Sketch uses 22980 bytes (...) Global variables use 1626 bytes (79%)
only 
Is there any way one can go down with SRAM usage further?
Assuming I have light switch/push button with only readable state (via pin on Arduino).
Following https://www.mysensors.org/download/serial_api_20#sensor-types ,should I present it via:
present(CHILD_ID, S_BINARY);
?
Later, having binary switch (which should be settable from controller) how it should be presented?
How controller can distinguish between RO button and RW switch?