BlueZ-5.35蓝牙设备开关控制的源码

1，bluetoothctl中开关蓝牙设备的命令

{ "power",        "", cmd_power, "Set controller power" }

static void cmd_power(const char *arg)
{
	dbus_bool_t powered;
	char *str;

	if (parse_argument_on_off(arg, &powered) == FALSE)
		return;

	if (check_default_ctrl() == FALSE)
		return;

	str = g_strdup_printf("power %s", powered == TRUE ? "on" : "off");

	if (g_dbus_proxy_set_property_basic(default_ctrl, "Powered",
					DBUS_TYPE_BOOLEAN, &powered,
					generic_callback, str, g_free) == TRUE)
		return;

	g_free(str);
}

static void generic_callback(const DBusError *error, void *user_data)
{
	char *str = user_data;

	if (dbus_error_is_set(error))
		rl_printf("Failed to set %s: %s\n", str, error->name);
	else
		rl_printf("Changing %s succeeded\n", str);
}

2，rfkill命令，可以软件关闭蓝牙设备

rfkill list
rfkill block XX
rfkill unblock XX

3，btmgmt中通过命令power关闭蓝牙设备

{ "power", cmd_power, "Toggle powered state" }

static void cmd_power(struct mgmt *mgmt, uint16_t index, int argc, char **argv)
{
	cmd_setting(mgmt, index, MGMT_OP_SET_POWERED, argc, argv);
}

static void cmd_setting(struct mgmt *mgmt, uint16_t index, uint16_t op,
							int argc, char **argv)
{
	uint8_t val;

	if (argc < 2) {
		print("Specify \"on\" or \"off\"");
		return noninteractive_quit(EXIT_FAILURE);
	}

	if (strcasecmp(argv[1], "on") == 0 || strcasecmp(argv[1], "yes") == 0)
		val = 1;
	else if (strcasecmp(argv[1], "off") == 0)
		val = 0;
	else
		val = atoi(argv[1]);

	if (index == MGMT_INDEX_NONE)
		index = 0;

	if (send_cmd(mgmt, op, index, sizeof(val), &val, setting_rsp) == 0) {
		error("Unable to send %s cmd", mgmt_opstr(op));
		return noninteractive_quit(EXIT_FAILURE);
	}
}

static unsigned int send_cmd(struct mgmt *mgmt, uint16_t op, uint16_t id,
				uint16_t len, const void *param,
				void (*cb)(uint16_t id, uint16_t op,
						uint8_t status, uint16_t len,
						const void *param))
{
	struct command_data *data;
	unsigned int send_id;

	data = new0(struct command_data, 1);
	if (!data)
		return 0;

	data->id = id;
	data->op = op;
	data->callback = cb;

	send_id = mgmt_send(mgmt, op, id, len, param, cmd_rsp, data, free);
	if (send_id == 0)
		free(data);

	return send_id;
}