@Luc3as Thanks for your response. No, in fact it was not enabled. Please read my reply to gohan. As you see, I've cheated my way out of this problem. In the process, I've lost track of the SD card on which I encountered this problem. Nonetheless, I will circle back to test your suggestion.
@gohan Thanks for the response. I downloaded the MySensors Library 2.1.1. Sorting through it I can see that SPI.h is included.
I installed a complete system in FL (I'm retired and a snowbird). Included are a Bunch of Arduino sensors, a Foscam Camera and Wemo switches. So I used a lot of material from MySensors to get the Arduino sensors up and running (great stuff: thanks to all those folks who created it). I then created a Raspberry Wireless (RF24) Gateway and installed Mosquitto to communicate with HomeAssistant. Took a while to configure HA, and I'm still learning.
I do not recall having a problem with the SPI library when assembling all this stuff. Upon return to Boston, I have made a number of improvements talking to the Raspberry in FL through TeamViewer (a great app). However, along the way, I corrupted the system in FL. It now limps. So, I started recreating the stuff in FL on a new SD card, encountering the SPI problem.
Since sending out my request for help, I found a backup version of my FL system on an SD card. Looking at it, the system seems to be whole and boots with no issues. mysgw works fine on it. So, I've added all my new stuff to this SD card and have tested it to make sure its working. Things are looking good and so, my immediate problem is solved (circumvented).
I still want to know what I am doing wrong with the gateway. I've learned a little bit of Python along the way. There, one installs a library. I know effectively nothing about C++. So, I've done nothing to install the library, only followed the instructions on the MySensors Raspberry Pi Gateway page.
BTW, this stuff is great.
Paul
I am a novice, trying to get the raspberry pi gateway to work. I did get it to work on one pi, but while installing it on the second, it produces the following error:
In file included from examples_linux/mysgw.cpp:74:0:
./MySensors.h:254:2: error: #error No support for nRF24 radio on this platform
#error No support for nRF24 radio on this platform
^
In file included from ./drivers/RF24/RF24.cpp:23:0,
from ./MySensors.h:290,
from examples_linux/mysgw.cpp:74:
./drivers/RF24/RF24.h:52:17: fatal error: SPI.h: No such file or directory
#include <SPI.h>
I can see that the SPI.h library is among the files downloaded.
Any ideas?
Paul