Возникли проблемы с переключением функций Bluetooth с помощью sd-bus в C. ⇐ Linux

[Anonymous]

I'm currently working on a project where I need to control Bluetooth functionality using sd-bus. I'm relatively new to sd-bus and would appreciate some assistance.

Specifically, I'm trying to write C code to replicate the functionality of the following command:

busctl set-property org.bluez /org/bluez/hci0 org.bluez.Adapter1 Powered b true and

busctl set-property org.bluez /org/bluez/hci0 org.bluez.Adapter1 Powered b false using the sd-bus library. I've attempted to achieve this using the sd_bus_set_property() function, and later using the method call approach similar to the source code of "busctl set-property" available here.

Below are the snippets of the code I've tried:

Code Snippet 1: Using sd_bus_set_property() Function:

#include #include #include #include #include int main(int argc, char *argv[]) { sd_bus_error error = SD_BUS_ERROR_NULL; sd_bus *bus = NULL; int r; bool powered = true; /* to turn on*/ //bool powered = false; /* to turn off*/ /* Connect to the system bus */ r = sd_bus_open_system(&bus); if (r < 0) { fprintf(stderr, "Failed to connect to system bus: %s\n", strerror(-r)); goto finish; } printf("Connected to system bus\n"); /* Set the property value */ r = sd_bus_set_property(bus, "org.bluez", /* service to contact */ "/org/bluez/hci0", /* object path */ "org.bluez.Adapter1",/* interface name */ "Powered", /* property name */ &error, /* object to return error in */ "b", /* type */ &powered /* pointer to boolean variable */ ); if (r < 0) { fprintf(stderr, "Failed to set property: %s\n", error.message); goto finish; } printf("Successfully turned off\n"); finish: sd_bus_error_free(&error); sd_bus_unref(bus); return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; } Code Snippet 2: Using Method Call Approach:

#include #include #include #include #include int main(int argc, char *argv[]) { sd_bus *bus = NULL; sd_bus_message *m = NULL; sd_bus_error error = SD_BUS_ERROR_NULL; int r; bool powered = true; /* to turn on*/ //bool powered = false; /* to turn off*/ r = sd_bus_open_system(&bus); if (r < 0) { fprintf(stderr, "Failed to connect to system bus: %s\n", strerror(-r)); goto finish; } printf("Connected to system bus\n"); r = sd_bus_message_new_method_call(bus, &m, "org.bluez", "/org/bluez/hci0", "org.freedesktop.DBus.Properties", "Set"); if (r < 0) { fprintf(stderr, "Failed to create method call: %s\n", strerror(-r)); goto finish; } r = sd_bus_message_append(m, "ss", "org.bluez.Adapter1", "Powered"); if (r < 0) { fprintf(stderr, "Failed to append message: %s\n", strerror(-r)); goto finish; } r = sd_bus_message_open_container(m, 'v', "b"); if (r < 0) { fprintf(stderr, "Failed to open container: %s\n", strerror(-r)); goto finish; } r = sd_bus_message_append_basic(m, 'b', &powered); if (r < 0) { fprintf(stderr, "Failed append_basic: %s\n", strerror(-r)); goto finish; } r = sd_bus_message_close_container(m); if (r < 0) { fprintf(stderr, "Failed to close container: %s\n", strerror(-r)); goto finish; } r = sd_bus_call(bus, m, 0, &error, NULL); if (r < 0) { fprintf(stderr, "Failed to make method call: %s\n", error.message); goto finish; } finish: sd_bus_error_free(&error); sd_bus_message_unref(m); sd_bus_unref(bus); return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; } When I set the value of powered to true and run the code, the adapter powers up as expected. However, when I set powered to false, the Bluetooth doesn't turn off. Additionally, if the Bluetooth is already off, the code seems to power up the adapter even when powered is set to false.

I'd greatly appreciate any insights or assistance regarding this issue. Thank you in advance!


Источник: https://stackoverflow.com/questions/781 ... d-bus-in-c