Function lua_mavlink_send_chan

libraries/AP_Scripting/lua_bindings.cpp:157–194

}

int lua_mavlink_send_chan(lua_State *L) {

    // Allow : and . access
    const int arg_offset = (luaL_testudata(L, 1, "mavlink") != NULL) ? 1 : 0;

    binding_argcheck(L, 3+arg_offset);
    
    const mavlink_channel_t chan = (mavlink_channel_t)get_uint32(L, 1+arg_offset, 0, MAVLINK_COMM_NUM_BUFFERS - 1);

    const uint32_t msgid = get_uint32(L, 2+arg_offset, 0, (1 << 24) - 1);

    const char *packet = luaL_checkstring(L, 3+arg_offset);

    // FIXME: The data that's in this mavlink_msg_entry_t should be provided from the script, which allows
    //        sending entirely new messages as outputs. At the moment we can only encode messages that
    //        are known at compile time. This is fine as a starting point as this is symmetrical to the
    //        decoding side of the scripting support
    const mavlink_msg_entry_t *entry = mavlink_get_msg_entry(msgid);
    if (entry == nullptr) {
        return luaL_error(L, "Unknown MAVLink message ID (%d)", msgid);
    }

    WITH_SEMAPHORE(comm_chan_lock(chan));
    if (comm_get_txspace(chan) >= (GCS_MAVLINK::packet_overhead_chan(chan) + entry->max_msg_len)) {
        _mav_finalize_message_chan_send(chan,
                                        entry->msgid,
                                        packet,
                                        entry->min_msg_len,
                                        entry->max_msg_len,
                                        entry->crc_extra);

        lua_pushboolean(L, true);
    } else {
        lua_pushboolean(L, false);
    }

    return 1;
}

int lua_mavlink_block_command(lua_State *L) {