static DBusMessage *characteristic_write_value(DBusConnection *conn,
DBusMessage *msg, void *user_data)
{
struct characteristic *chrc = user_data;
struct bt_gatt_client *gatt = chrc->service->client->gatt;
uint8_t *value = NULL;
size_t value_len = 0;
bool supported = false;
if (chrc->write_id)
return btd_error_in_progress(msg);
if (!parse_value_arg(msg, &value, &value_len))
return btd_error_invalid_args(msg);
/*
* Decide which write to use based on characteristic properties. For now
* we don't perform signed writes since gatt-client doesn't support them
* and the user can always encrypt the through pairing. The procedure to
* use is determined based on the following priority:
*
* * "reliable-write" property set -> reliable long-write.
* * "write" property set -> write request.
* - If value is larger than MTU - 3: long-write
* * "write-without-response" property set -> write command.
*/
if ((chrc->ext_props & BT_GATT_CHRC_EXT_PROP_RELIABLE_WRITE)) {
supported = true;
chrc->write_id = start_long_write(msg, chrc->value_handle, gatt,
true, value, value_len,
chrc, chrc_write_complete);
if (chrc->write_id)
return NULL;
}
if (chrc->props & BT_GATT_CHRC_PROP_WRITE) {
uint16_t mtu;
supported = true;
mtu = bt_gatt_client_get_mtu(gatt);
if (!mtu)
return btd_error_failed(msg, "No ATT transport");
if (value_len <= (unsigned) mtu - 3)
chrc->write_id = start_write_request(msg,
chrc->value_handle,
gatt, value, value_len,
chrc, chrc_write_complete);
else
chrc->write_id = start_long_write(msg,
chrc->value_handle, gatt,
false, value, value_len,
chrc, chrc_write_complete);
if (chrc->write_id)
return NULL;
}
if (!(chrc->props & BT_GATT_CHRC_PROP_WRITE_WITHOUT_RESP))
goto fail;
supported = true;
chrc->write_id = bt_gatt_client_write_without_response(gatt,
chrc->value_handle,
false, value,
value_len);
if (chrc->write_id)
return dbus_message_new_method_return(msg);
fail:
if (supported)
return btd_error_failed(msg, "Failed to initiate write");
return btd_error_not_supported(msg);
}
static void cmd_write_value(struct client *cli, char *cmd_str)
{
int opt, i;
char *argvbuf[516];
char **argv = argvbuf;
int argc = 1;
uint16_t handle;
char *endptr = NULL;
int length;
uint8_t *value = NULL;
bool without_response = false;
if (!bt_gatt_client_is_ready(cli->gatt)) {
printf("GATT client not initialized\n");
return;
}
if (!parse_args(cmd_str, 514, argv + 1, &argc)) {
printf("Too many arguments\n");
write_value_usage();
return;
}
optind = 0;
argv[0] = "write-value";
while ((opt = getopt_long(argc, argv, "+w", write_value_options,
NULL)) != -1) {
switch (opt) {
case 'w':
without_response = true;
break;
default:
write_value_usage();
return;
}
}
argc -= optind;
argv += optind;
if (argc < 1) {
write_value_usage();
return;
}
handle = strtol(argv[0], &endptr, 16);
if (!endptr || *endptr != '\0' || !handle) {
printf("Invalid handle: %s\n", argv[0]);
return;
}
length = argc - 1;
if (length > 0) {
if (length > UINT16_MAX) {
printf("Write value too long\n");
return;
}
value = malloc(length);
if (!value) {
printf("Failed to construct write value\n");
return;
}
for (i = 1; i < argc; i++) {
if (strlen(argv[i]) != 2) {
printf("Invalid value byte: %s\n",
argv[i]);
goto done;
}
value[i-1] = strtol(argv[i], &endptr, 16);
if (endptr == argv[i] || *endptr != '\0'
|| errno == ERANGE) {
printf("Invalid value byte: %s\n",
argv[i]);
goto done;
}
}
}
if (without_response) {
if (!bt_gatt_client_write_without_response(cli->gatt, handle,
false, value, length)) {
printf("Failed to initiate write without response "
"procedure\n");
goto done;
}
printf("Write command sent\n");
goto done;
}
if (!bt_gatt_client_write_value(cli->gatt, handle, value, length,
write_cb,
NULL, NULL))
printf("Failed to initiate write procedure\n");
done:
free(value);
}
