技術標籤：網路/通訊Coaplibcoap

1、下載libcoap原始碼

https://github.com/obgm/libcoap/tree/release-4.2.0

2、安裝步驟

./autogen.sh
mkdir Linux
./configure --prefix=$(pwd)/ISVP_lib --disable-dtls

執行如上操作時會有下列問題：

checking for dot... no
configure: WARNING: ==> dot not found - continuing without DOT support
configure: WARNING: ==> The libcoap html documentation will be build without DOT graphics!

checking for a2x... no
configure: WARNING: ==> You want to build the manpages, but a2x was not found!
configure: error: ==> Install the package that contains a2x (mostly asciidoc) or disable the build of the manpages using '--disable-manpages'.

解決辦法：

./configure --prefix=$(pwd)/Linux --disable-manpages --disable-dtls

無錯誤後之後執行

make && make install

生成的標頭檔案、庫檔案會存放在當前路徑的Linux目錄下

則我們就得到如下版本資訊：

3.編譯引數含義

執行./configure -help

`configure' configures libcoap 4.2.0 to adapt to many kinds of systems.

Usage: ./configure [OPTION]... [VAR=VALUE]...

To assign environment variables (e.g., CC, CFLAGS...), specify them as
VAR=VALUE. See below for descriptions of some of the useful variables.

Defaults for the options are specified in brackets.

Configuration:
-h, --help display this help and exit
--help=short display options specific to this package
--help=recursive display the short help of all the included packages
-V, --version display version information and exit
-q, --quiet, --silent do not print `checking ...' messages
--cache-file=FILE cache test results in FILE [disabled]
-C, --config-cache alias for `--cache-file=config.cache'
-n, --no-create do not create output files
--srcdir=DIR find the sources in DIR [configure dir or `..']

Installation directories:
--prefix=PREFIX install architecture-independent files in PREFIX
[/usr/local]
--exec-prefix=EPREFIX install architecture-dependent files in EPREFIX
[PREFIX]

By default, `make install' will install all the files in
`/usr/local/bin', `/usr/local/lib' etc. You can specify
an installation prefix other than `/usr/local' using `--prefix',
for instance `--prefix=$HOME'.

For better control, use the options below.

Fine tuning of the installation directories:
--bindir=DIR user executables [EPREFIX/bin]
--sbindir=DIR system admin executables [EPREFIX/sbin]
--libexecdir=DIR program executables [EPREFIX/libexec]
--sysconfdir=DIR read-only single-machine data [PREFIX/etc]
--sharedstatedir=DIR modifiable architecture-independent data [PREFIX/com]
--localstatedir=DIR modifiable single-machine data [PREFIX/var]
--libdir=DIR object code libraries [EPREFIX/lib]
--includedir=DIR C header files [PREFIX/include]
--oldincludedir=DIR C header files for non-gcc [/usr/include]
--datarootdir=DIR read-only arch.-independent data root [PREFIX/share]
--datadir=DIR read-only architecture-independent data [DATAROOTDIR]
--infodir=DIR info documentation [DATAROOTDIR/info]
--localedir=DIR locale-dependent data [DATAROOTDIR/locale]
--mandir=DIR man documentation [DATAROOTDIR/man]
--docdir=DIR documentation root [DATAROOTDIR/doc/libcoap]
--htmldir=DIR html documentation [DOCDIR]
--dvidir=DIR dvi documentation [DOCDIR]
--pdfdir=DIR pdf documentation [DOCDIR]
--psdir=DIR ps documentation [DOCDIR]

Program names:
--program-prefix=PREFIX prepend PREFIX to installed program names
--program-suffix=SUFFIX append SUFFIX to installed program names
--program-transform-name=PROGRAM run sed PROGRAM on installed program names

System types:
--build=BUILD configure for building on BUILD [guessed]
--host=HOST cross-compile to build programs to run on HOST [BUILD]

Optional Features:
--disable-option-checking ignore unrecognized --enable/--with options
--disable-FEATURE do not include FEATURE (same as --enable-FEATURE=no)
--enable-FEATURE[=ARG] include FEATURE [ARG=yes]
--enable-silent-rules less verbose build output (undo: "make V=1")
--disable-silent-rules verbose build output (undo: "make V=0")
--enable-dependency-tracking
do not reject slow dependency extractors
--disable-dependency-tracking
speeds up one-time build
--enable-shared[=PKGS] build shared libraries [default=yes]
--enable-static[=PKGS] build static libraries [default=yes]
--enable-fast-install[=PKGS]
optimize for fast installation [default=yes]
--disable-libtool-lock avoid locking (might break parallel builds)
--enable-documentation Enable building all the documentation [default=yes]
--enable-doxygen Enable building the doxygen documentation
[default=yes]
--enable-manpages Enable building the manpages [default=yes]
--enable-dtls Enable building with DTLS support [default=yes]
--enable-tests Enable building the binary testsuite [default=no]
--enable-examples Enable building the example binaries [default=yes]
--enable-gcov Enable building with gcov test coverage support
[default=no]

Optional Packages:
--with-PACKAGE[=ARG] use PACKAGE [ARG=yes]
--without-PACKAGE do not use PACKAGE (same as --with-PACKAGE=no)
--with-pic[=PKGS] try to use only PIC/non-PIC objects [default=use
both]
--with-gnu-ld assume the C compiler uses GNU ld [default=no]
--with-sysroot=DIR Search for dependent libraries within DIR
(or the compiler's sysroot if not specified).
--with-gnutls Use GnuTLS for DTLS functions
--with-openssl Use OpenSSL for DTLS functions
--with-tinydtls Use TinyDTLS for DTLS functions

Some influential environment variables:
PKG_CONFIG path to pkg-config utility
PKG_CONFIG_PATH
directories to add to pkg-config's search path
PKG_CONFIG_LIBDIR
path overriding pkg-config's built-in search path
CC C compiler command
CFLAGS C compiler flags
LDFLAGS linker flags, e.g. -L<lib dir> if you have libraries in a
nonstandard directory <lib dir>
LIBS libraries to pass to the linker, e.g. -l<library>
CPPFLAGS (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
you have headers in a nonstandard directory <include dir>
CPP C preprocessor
A2X a2x command
GnuTLS_CFLAGS
C compiler flags for GnuTLS, overriding pkg-config
GnuTLS_LIBS linker flags for GnuTLS, overriding pkg-config
OpenSSL_CFLAGS
C compiler flags for OpenSSL, overriding pkg-config
OpenSSL_LIBS
linker flags for OpenSSL, overriding pkg-config
CUNIT_CFLAGS
C compiler flags for CUNIT, overriding pkg-config
CUNIT_LIBS linker flags for CUNIT, overriding pkg-config
CTAGS_PROG the 'exctags' program to use for make target 'update-map-file'

Use these variables to override the choices made by `configure' or to help
it to find libraries and programs with nonstandard names/locations.

4.除錯使用

開啟服務端

cd examples/
./coap-server

這時候就可以在安裝好了Copper外掛的FireFox上開啟伺服器所在地址，注意:CoAP 除錯工具 Copper 是 Firefox 的一個外掛，這個外掛能支援的 Firefox 最高版本是52.0，與新版的 Firefox 不相容;可以在Chrome瀏覽器中安裝copper的外掛；

安裝Copper外掛的流程詳見《CoAP之客戶端Copper外掛（三）》