Function SocketAPM_recv

libraries/AP_Scripting/lua_bindings.cpp:998–1032

receive from a socket to a lua string */

  receive from a socket to a lua string
 */
int SocketAPM_recv(lua_State *L) {
    binding_argcheck(L, 2);

    SocketAPM * ud = *check_SocketAPM(L, 1);

    const uint16_t count = get_uint16_t(L, 2);
    uint8_t *data = (uint8_t*)malloc(count);
    if (data == nullptr) {
        return 0;
    }

    const auto ret = ud->recv(data, count, 0);
    if (ret < 0) {
        free(data);
        return 0;
    }

    int retcount = 1;

    // push data to lua string
    lua_pushlstring(L, (const char *)data, ret);

    // also push the address and port if available
    uint32_t ip_addr;
    uint16_t port;
    if (ud->last_recv_address(ip_addr, port)) {
        *new_uint32_t(L) = ip_addr;
        lua_pushinteger(L, port);
        retcount += 2;
    }

    free(data);

    return retcount;
}

/*
  TCP socket accept() call