118 lines
4.7 KiB
C
118 lines
4.7 KiB
C
/****************************************************************************
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* apps/examples/tcp_ipc_server/protocol.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "lorawan/uart_lorawan_layer.h"
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#include "protocol.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Definitions
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****************************************************************************/
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#define LORAWAN_DOWNLINK_TIME_MS 10000
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#define MAX_MESSAGE_SIZE 12
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#define SEND_MESSAGE 'U'
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#define DOWNLINK_RESPONSE 'D'
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/****************************************************************************
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* Name: send_msg_to_lpwan
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* Description: function that parses received message from a client and
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* sends a message to UART LoRaWAN layer based on parsed
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* data.
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* Parameters: - pointer to char array containing received message from
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* client
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* - pointer to a protocol structure variable, which will contain
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* the response to be sent back to client
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* Return: nothing
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****************************************************************************/
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void send_msg_to_lpwan(unsigned char *msg, protocolo_ipc *pt_protocol)
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{
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protocolo_ipc tprotocol;
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unsigned char buf_recv_downlink[13];
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int bytes_recv = 0;
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memcpy((unsigned char *)&tprotocol, msg, sizeof(protocolo_ipc));
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/* Parse message accordingly to received opcode */
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switch (tprotocol.opcode)
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{
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case SEND_MESSAGE:
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/* A client wants to send a LoRaWAN message. Here, the message is
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* forwarded to LoRaWAN transceiver
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*/
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memset(buf_recv_downlink, 0x00, sizeof(buf_recv_downlink));
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bytes_recv = lorawan_radioenge_send_msg(tprotocol.msg,
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tprotocol.msg_size,
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buf_recv_downlink,
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sizeof(buf_recv_downlink),
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LORAWAN_DOWNLINK_TIME_MS);
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printf("Number of Downlink bytes received: %d\n\n", bytes_recv);
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if (bytes_recv < MAX_MESSAGE_SIZE)
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{
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pt_protocol->opcode = DOWNLINK_RESPONSE;
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pt_protocol->msg_size = (unsigned char) bytes_recv;
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snprintf((char *)pt_protocol->msg, MAX_MESSAGE_SIZE, "%s",
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buf_recv_downlink);
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}
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break;
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default:
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break;
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}
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}
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