mirror of https://github.com/labapart/gattlib
133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
/*
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*
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* GattLib - GATT Library
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*
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* Copyright (C) 2016-2021 Olivier Martin <olivier@labapart.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef GATTLIB_LOG_BACKEND_SYSLOG
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#include <syslog.h>
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#endif
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#include "gattlib.h"
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typedef enum { READ, WRITE} operation_t;
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operation_t g_operation;
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static uuid_t g_uuid;
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long int value_data;
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static void usage(char *argv[]) {
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printf("%s <device_address> <read|write> <uuid> [<hex-value-to-write>]\n", argv[0]);
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}
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int main(int argc, char *argv[]) {
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int i, ret;
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size_t len;
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gatt_connection_t* connection;
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if ((argc != 4) && (argc != 5)) {
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usage(argv);
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return 1;
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}
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#ifdef GATTLIB_LOG_BACKEND_SYSLOG
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openlog("gattlib_read_write", LOG_CONS | LOG_NDELAY | LOG_PERROR, LOG_USER);
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setlogmask(LOG_UPTO(LOG_INFO));
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#endif
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if (strcmp(argv[2], "read") == 0) {
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g_operation = READ;
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} else if ((strcmp(argv[2], "write") == 0) && (argc == 5)) {
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g_operation = WRITE;
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if ((strlen(argv[4]) >= 2) && (argv[4][0] == '0') && ((argv[4][1] == 'x') || (argv[4][1] == 'X'))) {
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value_data = strtol(argv[4], NULL, 16);
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} else {
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value_data = strtol(argv[4], NULL, 0);
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}
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printf("Value to write: 0x%lx\n", value_data);
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} else {
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usage(argv);
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return 1;
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}
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if (gattlib_string_to_uuid(argv[3], strlen(argv[3]) + 1, &g_uuid) < 0) {
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usage(argv);
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return 1;
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}
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connection = gattlib_connect(NULL, argv[1], GATTLIB_CONNECTION_OPTIONS_LEGACY_DEFAULT);
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if (connection == NULL) {
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GATTLIB_LOG(GATTLIB_ERROR, "Fail to connect to the bluetooth device.");
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return 1;
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}
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if (g_operation == READ) {
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uint8_t *buffer = NULL;
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ret = gattlib_read_char_by_uuid(connection, &g_uuid, (void **)&buffer, &len);
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if (ret != GATTLIB_SUCCESS) {
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char uuid_str[MAX_LEN_UUID_STR + 1];
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gattlib_uuid_to_string(&g_uuid, uuid_str, sizeof(uuid_str));
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if (ret == GATTLIB_NOT_FOUND) {
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GATTLIB_LOG(GATTLIB_ERROR, "Could not find GATT Characteristic with UUID %s. "
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"You might call the program with '--gatt-discovery'.", uuid_str);
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} else {
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GATTLIB_LOG(GATTLIB_ERROR, "Error while reading GATT Characteristic with UUID %s (ret:%d)", uuid_str, ret);
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}
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goto EXIT;
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}
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printf("Read UUID completed: ");
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for (i = 0; i < len; i++) {
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printf("%02x ", buffer[i]);
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}
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printf("\n");
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gattlib_characteristic_free_value(buffer);
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} else {
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ret = gattlib_write_char_by_uuid(connection, &g_uuid, &value_data, sizeof(value_data));
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if (ret != GATTLIB_SUCCESS) {
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char uuid_str[MAX_LEN_UUID_STR + 1];
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gattlib_uuid_to_string(&g_uuid, uuid_str, sizeof(uuid_str));
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if (ret == GATTLIB_NOT_FOUND) {
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GATTLIB_LOG(GATTLIB_ERROR, "Could not find GATT Characteristic with UUID %s. "
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"You might call the program with '--gatt-discovery'.", uuid_str);
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} else {
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GATTLIB_LOG(GATTLIB_ERROR, "Error while writing GATT Characteristic with UUID %s (ret:%d)",
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uuid_str, ret);
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}
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goto EXIT;
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}
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}
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EXIT:
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gattlib_disconnect(connection);
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return ret;
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}
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