[riot-notifications] [RIOT-OS/RIOT] TCP client cannot send read only data (#16541)

kex2017 notifications at github.com
Wed Jun 9 08:22:09 CEST 2021

#### Description
TCP client  cannot  send read only data

#### Steps to reproduce the issue
test ipv4 tcp client send const data like this "const char sendbuf[] = "Hello!";"
The test code is as follows:
const char sendbuf[] = "Hello!";
int test_tcp_client(void)
    int res = 0;
    sock_tcp_t sock;
    sock_tcp_ep_t remote = SOCK_IPV4_EP_ANY;

    remote.port = SERVER_PORT;//SERVER_PORT=12345

    ipv4_addr_from_str((ipv4_addr_t *)&remote.addr, SERVER_IP_ADDR);//SERVER_IP_ADDR=

    if (sock_tcp_connect(&sock, &remote, 0, 0) < 0)
        puts("Error connecting sock");
        return 1;

    puts("Sending \"Hello!\"");
    if ((res = sock_tcp_write(&sock, sendbuf, sizeof(sendbuf))) < 0)
        puts("Errored on write");
    puts("send over...");
However, if the data sent is modified to  "char sendbuf[] = "Hello!";", without  "const",it will be sent successfully

#### Expected results
output "send over...",server receive "Hello!"

#### Actual results
only output "Sending "Hello!"",The server did not receive the data

#### Versions
Operating System Environment
         Operating System: "Ubuntu" "18.04.5 LTS (Bionic Beaver)"
                   Kernel: Linux 5.4.0-73-generic x86_64 x86_64
             System shell: /bin/dash (probably dash)
             make's shell: /bin/dash (probably dash)

Installed compiler toolchains
               native gcc: gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0
        arm-none-eabi-gcc: arm-none-eabi-gcc (GNU Tools for Arm Embedded Processors 7-2018-q2-update) 7.3.1 20180622 (release) [ARM/embedded-7-branch revision 261907]
                  avr-gcc: missing
         mips-mti-elf-gcc: missing
           msp430-elf-gcc: missing
       riscv-none-elf-gcc: missing
  riscv64-unknown-elf-gcc: missing
     riscv-none-embed-gcc: missing
     xtensa-esp32-elf-gcc: missing
   xtensa-esp8266-elf-gcc: missing
                    clang: missing

Installed compiler libs
     arm-none-eabi-newlib: "3.0.0"
      mips-mti-elf-newlib: missing
        msp430-elf-newlib: missing
    riscv-none-elf-newlib: missing
riscv64-unknown-elf-newlib: missing
  riscv-none-embed-newlib: missing
  xtensa-esp32-elf-newlib: missing
xtensa-esp8266-elf-newlib: missing
                 avr-libc: missing (missing)

Installed development tools
                   ccache: missing
                    cmake: cmake version 3.10.2
                 cppcheck: missing
                  doxygen: 1.8.13
                      git: git version 2.17.1
                     make: GNU Make 4.1
                  openocd: missing
                   python: Python 2.7.17
                  python2: Python 2.7.17
                  python3: Python 3.6.9
                   flake8: error: /usr/bin/python3: No module named flake8
               coccinelle: missing

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