This project is to transplant the mqtt protocol on i.mx6u
Record the problems and solutions when transplanting the mqtt protocol:
First of all, there is a problem when compiling MQTT according to the tutorial of punctual atoms. The reason is that there is a problem with the Makefile, and there is a problem with the openssl library when cross-compiling.
1. Download and cross-compile openssl
1.1 Download openssl
openssl official website
https://www.openssl.org/source/
Create a new folder openssl_arm to save the source code, and create an installation directory ssl_arm under this folder path
1.2 Configure source files to generate Makefile
sudo ./config no-async no-asm shared --prefix=/home/yzj/tools/openssl_arm/ssl_arm --cross-compile-prefix=arm-linux-gnueabihf-
Change the path in the command to your own path
After successful execution, a Makefile will be created in the directory
1.3 Modify Makefile
Enter openssl-1.1.1s, modify the makefile in this directory
It can be opened with the vim command, here I directly use vscode to open it for easy modification
1. Delete -m64 in the Makefile
In vscode, Ctrl + F searches for -m64 and deletes it. In some versions of the makefile, you need to check whether the compiler is arm-linux-gnueabihf- If not, you need to modify it one by one, such as gcc, ar, g++, etc.
2. Compile and generate related libraries
make & amp; & amp; make install
After compiling and installing, the ssl_arm directory is as follows, that is, the openssl cross-compilation is completed
2. Cross compilation and transplantation paho. mqttd
2. Cross compilation and transplantation paho. mqttd1.1 Download paho.mqtt.c-1.3.0 source code
Paho mqtt official website address: https://github.com/eclipse/paho.mqtt.c/releases
I downloaded version 1.3.0, please check the situation yourself and try to be consistent with me.
1.2 Modify Makefile
1. After downloading and decompressing, create the following folders under the paho.mqtt.c-1.3.0 folder
2. After the creation is complete, modify the Makefile as follows
Modify to specify the path build/install/local
3. Specify the cross-compilation toolchain
CC=/usr/local/arm/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gcc
4. Add ssl library path
CCFLAGS_SO + = -I /home/yzj/tools/openssl_arm/ssl_arm/include LDFLAGS_C += -L /home/yzj/tools/openssl_arm/ssl_arm/lib LDFLAGS_CS += -L /home/yzj/tools/openssl_arm/ssl_arm/lib LDFLAGS_A += -L /home/yzj/tools/openssl_arm/ssl_arm/lib LDFLAGS_AS += -L /home/yzj/tools/openssl_arm/ssl_arm/lib FLAGS_EXE += -L /home/yzj/tools/openssl_arm/ssl_arm/lib FLAGS_EXES += -L /home/yzj/tools/openssl_arm/ssl_arm/lib
Note: The path needs to be modified according to your own path
Above is my path.
5. Modify install and uninstall
install:
install: build
mkdir -p $(DESTDIR)$(PREFIX)${includedir}
mkdir -p $(DESTDIR)$(PREFIX)${libdir}
mkdir -p $(DESTDIR)$(PREFIX)${bindir}
mkdir -p $(DESTDIR)${man1dir}
mkdir -p $(DESTDIR)${man3dir}
cp -f ${MQTTLIB_C_TARGET} $(DESTDIR)${libdir}
cp -f ${MQTTLIB_CS_TARGET} $(DESTDIR)${libdir}
cp -f ${MQTTLIB_A_TARGET} $(DESTDIR)${libdir}
cp -f ${MQTTLIB_AS_TARGET} $(DESTDIR)${libdir}
cp -f ${MQTTVERSION_TARGET} $(DESTDIR)${bindir}
cp -f ${PAHO_C_PUB_TARGET} $(DESTDIR)${bindir}
cp -f ${PAHO_C_SUB_TARGET} $(DESTDIR)${bindir}
cp -f ${PAHO_CS_PUB_TARGET} $(DESTDIR)${bindir}
cp -f ${PAHO_CS_SUB_TARGET} $(DESTDIR)${bindir}
ln -sf lib$(MQTTLIBC).so.${MAJOR_VERSION} $(DESTDIR)${libdir}/lib$(MQTTLIB_C).so
ln -sf lib$(MQTTLIB_CS).so.${MAJOR_VERSION} $(DESTDIR)${libdir}/lib$(MQTTLIB_CS).so
ln -sf lib$(MQTTLIB_A).so.${MAJOR_VERSION} $(DESTDIR)${libdir}/lib$(MQTTLIB_A).so
ln -sf lib$(MQTTLIB_AS).so.${MAJOR_VERSION} $(DESTDIR)${libdir}/lib$(MQTTLIB_AS).so
ln -sf lib$(MQTTLIB_C).so.${VERSION} $(DESTDIR)${libdir}/lib$(MQTTLIB_C).so.${MAJOR_VERSION}
ln -sf lib$(MQTTLIB_CS).so.${VERSION} $(DESTDIR)${libdir}/lib$(MQTTLIB_CS).so.${MAJOR_VERSION}
ln -sf lib$(MQTTLIB_A).so.${VERSION} $(DESTDIR)${libdir}/lib$(MQTTLIB_A).so.${MAJOR_VERSION}
ln -sf lib$(MQTTLIB_AS).so.${VERSION} $(DESTDIR)${libdir}/lib$(MQTTLIB_AS).so.${MAJOR_VERSION}
cp -f ${srcdir}/MQTTAsync.h $(DESTDIR)${includedir}
cp -f ${srcdir}/MQTTClient.h $(DESTDIR)${includedir}
cp -f ${srcdir}/MQTTClientPersistence.h $(DESTDIR)${includedir}
cp -f ${srcdir}/MQTTProperties.h $(DESTDIR)${includedir}
cp -f ${srcdir}/MQTTReasonCodes.h $(DESTDIR)${includedir}
cp -f ${srcdir}/MQTTSubscribeOpts.h $(DESTDIR)${includedir}
- cp -f doc/man/man1/paho_c_pub.1 $(DESTDIR)${man1dir}
- cp -f doc/man/man1/paho_c_sub.1 $(DESTDIR)${man1dir}
- cp -f doc/man/man1/paho_cs_pub.1 $(DESTDIR)${man1dir}
- cp -f doc/man/man1/paho_cs_sub.1 $(DESTDIR)${man1dir}
- cp -f ${blddir}/doc/MQTTClient/man/man3/MQTTClient.h.3 $(DESTDIR)${man3dir}
- cp -f ${blddir}/doc/MQTTAsync/man/man3/MQTTAsync.h.3 $(DESTDIR)${man3dir}
@echo ""
@echo “make install finish”, 'date'
@echo ""
uninstall:
uninstall: rm -rf $(blddir_work) @echo "" @echo “make uninstall finish”, 'date' @echo ""
1.3 Compile
After the modification, make & amp; & amp; make install to generate the library
Here comes the point, if the following error occurs after executing the above command:
Check the build path and find that the doc folder is not generated. You need to run make html to generate it. When running make html, an error is reported /bin/sh: 1: doxygen: not found, and doxygen is not installed. Refer to this article: https://blog .csdn.net/yamida/article/details/79428515
After the installation is complete: sudo make uninstall to remove the wrong installation before, then make html, after no error is reported, then sudo make install to reinstall. as follows:
The next step is to package and transplant the i.max6ull. In general, I still encounter various problems, but it takes a little time to solve them.
Reference: http://e.betheme.net/zz/822260.aspx?action=onClick