circuitpython/shared-bindings/_bleio/Characteristic.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Dan Halbert for Adafruit Industries
* Copyright (c) 2018 Artur Pacholec
* Copyright (c) 2017 Glenn Ruben Bakke
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/objproperty.h"
#include "py/runtime.h"
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#include "shared-bindings/_bleio/Attribute.h"
#include "shared-bindings/_bleio/Characteristic.h"
#include "shared-bindings/_bleio/Service.h"
#include "shared-bindings/_bleio/UUID.h"
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//| class Characteristic:
//| """Stores information about a BLE service characteristic and allows reading
//| and writing of the characteristic's value."""
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//|
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//| def __init__(self) -> None:
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//| """There is no regular constructor for a Characteristic. A new local Characteristic can be created
//| and attached to a Service by calling `add_to_service()`.
//| Remote Characteristic objects are created by `Connection.discover_remote_services()`
//| as part of remote Services."""
//| ...
//|
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//| def add_to_service(self, service: Service, uuid: UUID, *, properties: int = 0, read_perm: int = Attribute.OPEN, write_perm: int = Attribute.OPEN, max_length: int = 20, fixed_length: bool = False, initial_value: Optional[ReadableBuffer] = None) -> Characteristic:
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//| """Create a new Characteristic object, and add it to this Service.
//|
//| :param Service service: The service that will provide this characteristic
//| :param UUID uuid: The uuid of the characteristic
//| :param int properties: The properties of the characteristic,
//| specified as a bitmask of these values bitwise-or'd together:
//| `BROADCAST`, `INDICATE`, `NOTIFY`, `READ`, `WRITE`, `WRITE_NO_RESPONSE`.
//| :param int read_perm: Specifies whether the characteristic can be read by a client, and if so, which
//| security mode is required. Must be one of the integer values `Attribute.NO_ACCESS`, `Attribute.OPEN`,
//| `Attribute.ENCRYPT_NO_MITM`, `Attribute.ENCRYPT_WITH_MITM`, `Attribute.LESC_ENCRYPT_WITH_MITM`,
//| `Attribute.SIGNED_NO_MITM`, or `Attribute.SIGNED_WITH_MITM`.
//| :param int write_perm: Specifies whether the characteristic can be written by a client, and if so, which
//| security mode is required. Values allowed are the same as ``read_perm``.
//| :param int max_length: Maximum length in bytes of the characteristic value. The maximum allowed is
//| is 512, or possibly 510 if ``fixed_length`` is False. The default, 20, is the maximum
//| number of data bytes that fit in a single BLE 4.x ATT packet.
//| :param bool fixed_length: True if the characteristic value is of fixed length.
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//| :param ~_typing.ReadableBuffer initial_value: The initial value for this characteristic. If not given, will be
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//| filled with zeros.
//|
//| :return: the new Characteristic."""
//| ...
//|
STATIC mp_obj_t bleio_characteristic_add_to_service(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
// class is arg[0], which we can ignore.
enum { ARG_service, ARG_uuid, ARG_properties, ARG_read_perm, ARG_write_perm,
ARG_max_length, ARG_fixed_length, ARG_initial_value };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_service, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_uuid, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_properties, MP_ARG_KW_ONLY| MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_read_perm, MP_ARG_KW_ONLY| MP_ARG_INT, {.u_int = SECURITY_MODE_OPEN} },
{ MP_QSTR_write_perm, MP_ARG_KW_ONLY| MP_ARG_INT, {.u_int = SECURITY_MODE_OPEN} },
{ MP_QSTR_max_length, MP_ARG_KW_ONLY| MP_ARG_INT, {.u_int = 20} },
{ MP_QSTR_fixed_length, MP_ARG_KW_ONLY| MP_ARG_BOOL, {.u_bool = false} },
{ MP_QSTR_initial_value, MP_ARG_KW_ONLY| MP_ARG_OBJ, {.u_obj = mp_const_none} },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
const mp_obj_t service_obj = args[ARG_service].u_obj;
if (!MP_OBJ_IS_TYPE(service_obj, &bleio_service_type)) {
mp_raise_TypeError(translate("Expected a Service"));
}
const mp_obj_t uuid_obj = args[ARG_uuid].u_obj;
if (!MP_OBJ_IS_TYPE(uuid_obj, &bleio_uuid_type)) {
mp_raise_TypeError(translate("Expected a UUID"));
}
const bleio_characteristic_properties_t properties = args[ARG_properties].u_int;
if (properties & ~CHAR_PROP_ALL) {
mp_raise_ValueError(translate("Invalid properties"));
}
const bleio_attribute_security_mode_t read_perm = args[ARG_read_perm].u_int;
common_hal_bleio_attribute_security_mode_check_valid(read_perm);
const bleio_attribute_security_mode_t write_perm = args[ARG_write_perm].u_int;
common_hal_bleio_attribute_security_mode_check_valid(write_perm);
const mp_int_t max_length = args[ARG_max_length].u_int;
const bool fixed_length = args[ARG_fixed_length].u_bool;
mp_obj_t initial_value = args[ARG_initial_value].u_obj;
// Length will be validated in common_hal.
mp_buffer_info_t initial_value_bufinfo;
if (initial_value == mp_const_none) {
if (fixed_length && max_length > 0) {
initial_value = mp_obj_new_bytes_of_zeros(max_length);
} else {
initial_value = mp_const_empty_bytes;
}
}
mp_get_buffer_raise(initial_value, &initial_value_bufinfo, MP_BUFFER_READ);
bleio_characteristic_obj_t *characteristic = m_new_obj(bleio_characteristic_obj_t);
characteristic->base.type = &bleio_characteristic_type;
// Range checking on max_length arg is done by the common_hal layer, because
// it may vary depending on underlying BLE implementation.
common_hal_bleio_characteristic_construct(
characteristic, MP_OBJ_TO_PTR(service_obj), 0, MP_OBJ_TO_PTR(uuid_obj),
properties, read_perm, write_perm,
max_length, fixed_length, &initial_value_bufinfo);
return MP_OBJ_FROM_PTR(characteristic);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(bleio_characteristic_add_to_service_fun_obj, 3, bleio_characteristic_add_to_service);
STATIC MP_DEFINE_CONST_CLASSMETHOD_OBJ(bleio_characteristic_add_to_service_obj, MP_ROM_PTR(&bleio_characteristic_add_to_service_fun_obj));
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//| properties: int
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//| """An int bitmask representing which properties are set, specified as bitwise or'ing of
//| of these possible values.
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//| `BROADCAST`, `INDICATE`, `NOTIFY`, `READ`, `WRITE`, `WRITE_NO_RESPONSE`."""
//|
STATIC mp_obj_t bleio_characteristic_get_properties(mp_obj_t self_in) {
bleio_characteristic_obj_t *self = MP_OBJ_TO_PTR(self_in);
return MP_OBJ_NEW_SMALL_INT(common_hal_bleio_characteristic_get_properties(self));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(bleio_characteristic_get_properties_obj, bleio_characteristic_get_properties);
const mp_obj_property_t bleio_characteristic_properties_obj = {
.base.type = &mp_type_property,
.proxy = { (mp_obj_t)&bleio_characteristic_get_properties_obj,
(mp_obj_t)&mp_const_none_obj,
(mp_obj_t)&mp_const_none_obj },
};
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//| uuid: Optional[UUID]
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//| """The UUID of this characteristic. (read-only)
//|
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//| Will be ``None`` if the 128-bit UUID for this characteristic is not known."""
//|
STATIC mp_obj_t bleio_characteristic_get_uuid(mp_obj_t self_in) {
bleio_characteristic_obj_t *self = MP_OBJ_TO_PTR(self_in);
bleio_uuid_obj_t *uuid = common_hal_bleio_characteristic_get_uuid(self);
return uuid ? MP_OBJ_FROM_PTR(uuid) : mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(bleio_characteristic_get_uuid_obj, bleio_characteristic_get_uuid);
const mp_obj_property_t bleio_characteristic_uuid_obj = {
.base.type = &mp_type_property,
.proxy = { (mp_obj_t)&bleio_characteristic_get_uuid_obj,
(mp_obj_t)&mp_const_none_obj,
(mp_obj_t)&mp_const_none_obj },
};
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//| value: bytearray
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//| """The value of this characteristic."""
//|
STATIC mp_obj_t bleio_characteristic_get_value(mp_obj_t self_in) {
bleio_characteristic_obj_t *self = MP_OBJ_TO_PTR(self_in);
uint8_t temp[512];
size_t actual_len = common_hal_bleio_characteristic_get_value(self, temp, sizeof(temp));
return mp_obj_new_bytearray(actual_len, temp);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(bleio_characteristic_get_value_obj, bleio_characteristic_get_value);
STATIC mp_obj_t bleio_characteristic_set_value(mp_obj_t self_in, mp_obj_t value_in) {
bleio_characteristic_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(value_in, &bufinfo, MP_BUFFER_READ);
common_hal_bleio_characteristic_set_value(self, &bufinfo);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(bleio_characteristic_set_value_obj, bleio_characteristic_set_value);
const mp_obj_property_t bleio_characteristic_value_obj = {
.base.type = &mp_type_property,
.proxy = { (mp_obj_t)&bleio_characteristic_get_value_obj,
(mp_obj_t)&bleio_characteristic_set_value_obj,
(mp_obj_t)&mp_const_none_obj },
};
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//| descriptors: Descriptor
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//| """A tuple of :py:class:`Descriptor` that describe this characteristic. (read-only)"""
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//|
STATIC mp_obj_t bleio_characteristic_get_descriptors(mp_obj_t self_in) {
bleio_characteristic_obj_t *self = MP_OBJ_TO_PTR(self_in);
// Return list as a tuple so user won't be able to change it.
bleio_descriptor_obj_t *descriptors = common_hal_bleio_characteristic_get_descriptor_list(self);
bleio_descriptor_obj_t *head = descriptors;
size_t len = 0;
while (head != NULL) {
len++;
head = head->next;
}
mp_obj_tuple_t * t = MP_OBJ_TO_PTR(mp_obj_new_tuple(len, NULL));
head = descriptors;
for (size_t i = len - 1; i >= 0; i--) {
t->items[i] = MP_OBJ_FROM_PTR(head);
head = head->next;
}
return MP_OBJ_FROM_PTR(t);
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}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(bleio_characteristic_get_descriptors_obj, bleio_characteristic_get_descriptors);
const mp_obj_property_t bleio_characteristic_descriptors_obj = {
.base.type = &mp_type_property,
.proxy = { (mp_obj_t)&bleio_characteristic_get_descriptors_obj,
(mp_obj_t)&mp_const_none_obj,
(mp_obj_t)&mp_const_none_obj },
};
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//| service: Service
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//| """The Service this Characteristic is a part of."""
//|
STATIC mp_obj_t bleio_characteristic_get_service(mp_obj_t self_in) {
bleio_characteristic_obj_t *self = MP_OBJ_TO_PTR(self_in);
return common_hal_bleio_characteristic_get_service(self);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(bleio_characteristic_get_service_obj, bleio_characteristic_get_service);
const mp_obj_property_t bleio_characteristic_service_obj = {
.base.type = &mp_type_property,
.proxy = { (mp_obj_t)&bleio_characteristic_get_service_obj,
(mp_obj_t)&mp_const_none_obj,
(mp_obj_t)&mp_const_none_obj },
};
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//| def set_cccd(self, *, notify: bool = False, indicate: bool = False) -> None:
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//| """Set the remote characteristic's CCCD to enable or disable notification and indication.
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//|
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//| :param bool notify: True if Characteristic should receive notifications of remote writes
//| :param float indicate: True if Characteristic should receive indications of remote writes"""
//| ...
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//|
STATIC mp_obj_t bleio_characteristic_set_cccd(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
bleio_characteristic_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
enum { ARG_notify, ARG_indicate };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_notify, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
{ MP_QSTR_indicate, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
common_hal_bleio_characteristic_set_cccd(self, args[ARG_notify].u_bool, args[ARG_indicate].u_bool);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(bleio_characteristic_set_cccd_obj, 1, bleio_characteristic_set_cccd);
STATIC const mp_rom_map_elem_t bleio_characteristic_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_add_to_service), MP_ROM_PTR(&bleio_characteristic_add_to_service_obj) },
{ MP_ROM_QSTR(MP_QSTR_properties), MP_ROM_PTR(&bleio_characteristic_properties_obj) },
{ MP_ROM_QSTR(MP_QSTR_uuid), MP_ROM_PTR(&bleio_characteristic_uuid_obj) },
{ MP_ROM_QSTR(MP_QSTR_value), MP_ROM_PTR(&bleio_characteristic_value_obj) },
{ MP_ROM_QSTR(MP_QSTR_set_cccd), MP_ROM_PTR(&bleio_characteristic_set_cccd_obj) },
// Bitmask constants to represent properties
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//| BROADCAST: int
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//| """property: allowed in advertising packets"""
//|
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//| INDICATE: int
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//| """property: server will indicate to the client when the value is set and wait for a response"""
//|
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//| NOTIFY: int
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//| """property: server will notify the client when the value is set"""
//|
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//| READ: int
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//| """property: clients may read this characteristic"""
//|
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//| WRITE: int
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//| """property: clients may write this characteristic; a response will be sent back"""
//|
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//| WRITE_NO_RESPONSE: int
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//| """property: clients may write this characteristic; no response will be sent back"""
//|
{ MP_ROM_QSTR(MP_QSTR_BROADCAST), MP_ROM_INT(CHAR_PROP_BROADCAST) },
{ MP_ROM_QSTR(MP_QSTR_INDICATE), MP_ROM_INT(CHAR_PROP_INDICATE) },
{ MP_ROM_QSTR(MP_QSTR_NOTIFY), MP_ROM_INT(CHAR_PROP_NOTIFY) },
{ MP_ROM_QSTR(MP_QSTR_READ), MP_ROM_INT(CHAR_PROP_READ) },
{ MP_ROM_QSTR(MP_QSTR_WRITE), MP_ROM_INT(CHAR_PROP_WRITE) },
{ MP_ROM_QSTR(MP_QSTR_WRITE_NO_RESPONSE), MP_ROM_INT(CHAR_PROP_WRITE_NO_RESPONSE) },
};
STATIC MP_DEFINE_CONST_DICT(bleio_characteristic_locals_dict, bleio_characteristic_locals_dict_table);
STATIC void bleio_characteristic_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
bleio_characteristic_obj_t *self = MP_OBJ_TO_PTR(self_in);
if (self->uuid) {
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mp_printf(print, "Characteristic(");
bleio_uuid_print(print, MP_OBJ_FROM_PTR(self->uuid), kind);
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mp_printf(print, ")");
} else {
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mp_printf(print, "<Characteristic with Unregistered UUID>");
}
}
const mp_obj_type_t bleio_characteristic_type = {
{ &mp_type_type },
.name = MP_QSTR_Characteristic,
.print = bleio_characteristic_print,
.locals_dict = (mp_obj_dict_t*)&bleio_characteristic_locals_dict,
};