1 摘要

運行平臺：君正x2000

藍牙：bluez5.54

編譯器：mips-linux-gnu-gcc (gcc version 7.2.0 (Ingenic r4.0.0-gcc720 2018.02-28))

編譯主機：ubuntu 18.04

1.2 完整代碼請參考

https://download.csdn.net/download/huohongpeng/16681815?spm=1001.2014.3001.5501

2 串口gatt

/** Copyright (C) 2021, 2021 huohongpeng* Author: huohongpeng <1045338804@qq.com>** This program is free software; you can redistribute it and/or modify* it under the terms of the GNU General Public License as published by* the Free Software Foundation; either version 2 of the License, or* (at your option) any later version.** Change logs:* Date Author Notes* 2021-04-12 huohongpeng 初次創建* 1.藍牙版本bluez5.54* 2.實現了uart的gatt service* 3.為了便于使用Nordic的APP(nRF Connect)調試,程序中的UUID使用的都是Nodic的uart的UUID*/#include <gio/gio.h> #include <stdlib.h> #include <glib.h> #include <string.h> #include <stdint.h>#include "gatt.h" #include "log.h"//#define __DEBUG__#define UART_OBJECT_PATH "/org/uart/server"static const gchar object_manager_xml[] = "<node>" " <interface name='org.freedesktop.DBus.ObjectManager'>" " <method name='GetManagedObjects'>" " <arg name='objects' type='a{oa{sa{sv}}}' direction='out'/>" " </method>" " <signal name='InterfacesRemoved'>" " <arg name='interfaces' type='as'/>" " </signal>" " </interface>" "</node>";/** 服務對象的xml*/ static const gchar service_xml[] = "<node>" " <interface name='org.bluez.GattService1'>" " <property name='UUID' type='s' access='read'/>" " <property name='Primary' type='b' access='read'/>" " </interface>" "</node>";/** 特性對象的xml*/ static const gchar char_xml[] = "<node>" " <interface name='org.bluez.GattCharacteristic1'>" " <property name='UUID' type='s' access='read'/>" " <property name='Service' type='o' access='read'/>" " <property name='Value' type='ay' access='read'/>" " <property name='Notifying' type='b' access='read'/>" " <property name='Flags' type='as' access='read'/>" " <method name='ReadValue'>" " <arg name='options' type='a{sv}' direction='in'/>" " <arg name='value' type='ay' direction='out'/>" " </method>" " <method name='WriteValue'>" " <arg name='value' type='ay' direction='in'/>" " <arg name='options' type='a{sv}' direction='in'/>" " </method>" " <method name='StartNotify'>" " </method>" " <method name='StopNotify'/>" " </interface>" "</node>";#define CHAR_FLAGS_SIZE 17struct char_t {char *UUID;char *Service;uint8_t Value[512];int len;/* @Flags:* "broadcast"* "read"* "write-without-response"* "write"* "notify"* "indicate"* "authenticated-signed-writes"* "extended-properties"* "reliable-write"* "writable-auxiliaries"* "encrypt-read"* "encrypt-write"* "encrypt-authenticated-read"* "encrypt-authenticated-write"* "secure-read" (Server only)* "secure-write" (Server only)* "authorize"*/char *Flags[CHAR_FLAGS_SIZE];/** True, if notifications or indications on this* characteristic are currently enabled.*/int Notifying;};struct service_t {char *UUID;/** Indicates whether or not this GATT service is a* primary service. If false, the service is secondary.*/int Primary; };struct server_t {struct {struct service_t service;struct char_t rx_char;struct char_t tx_char;} gatt;GDBusConnection *conn;GDBusNodeInfo *object_manager_node_info;guint object_manager_reg_id;GDBusNodeInfo *service_node_info;guint service_reg_id;GDBusNodeInfo *char_node_info;guint tx_char_reg_id;guint rx_char_reg_id;uart_receive_t receive_cb_func; };/* -> /org/uart/server| - org.freedesktop.DBus.ObjectManager|-> /org/uart/server/service00| | - org.freedesktop.DBus.Properties| | - org.bluez.GattService1| || -> /org/uart/server/service00/char0000| | - org.freedesktop.DBus.Properties| | - org.bluez.GattCharacteristic1| || -> /org/uart/server/service00/char0001| | - org.freedesktop.DBus.Properties| | - org.bluez.GattCharacteristic1| || -> /org/uart/server/service00/char0001/desc000 (cccd被bluez自動創建)| - org.freedesktop.DBus.Properties| - org.bluez.GattDescriptor1|-> /org/uart/server/serviceXX| - org.freedesktop.DBus.Properties| - org.bluez.GattService1|-> /org/uart/server/serviceXX/char0000- org.freedesktop.DBus.Properties- org.bluez.GattCharacteristic1 */static struct server_t server_ctx = {.gatt = {.service = {.UUID = "6e400001-b5a3-f393-e0a9-e50e24dcca9e",.Primary = 1,},/** "/service00/char0000"*/.rx_char = {.UUID = "6e400002-b5a3-f393-e0a9-e50e24dcca9e",.Service = UART_OBJECT_PATH"/service00",.Flags = {[0] = "write-without-response",//[1] = "read",},},/** "/service00/char0001"*/.tx_char = {.UUID = "6e400003-b5a3-f393-e0a9-e50e24dcca9e",.Service = UART_OBJECT_PATH"/service00",.Flags = {[0] = "notify",},},}, };void gatt_uart_register_receive_cb(uart_receive_t receive_cb) {server_ctx.receive_cb_func = receive_cb; }/** 最大發送512個字節*/ void gatt_uart_send(uint8_t *buf, int len) {if(!server_ctx.conn || !server_ctx.gatt.tx_char.Notifying || len > 512) {return ;}memcpy(server_ctx.gatt.tx_char.Value, buf, len);server_ctx.gatt.tx_char.len = len;/** 通知是通過PropertiesChanged信號實現的。* 當bluez收到Value屬性PropertiesChanged的信號,* bluez就會向客戶端發送notification 或者 indication。** 參考:doc/gatt-api.txt* The cached value of the characteristic. This property* gets updated only after a successful read request and* when a notification or indication is received, upon* which a PropertiesChanged signal will be emitted.*/GVariant *parameters[3];/** interface_name*/parameters[0] = g_variant_new_string("org.bluez.GattCharacteristic1");/** changed_properties*/GVariantBuilder *builder = g_variant_builder_new(G_VARIANT_TYPE("ay"));int i;for(i = 0; i < server_ctx.gatt.tx_char.len; i++) {g_variant_builder_add(builder, "y", server_ctx.gatt.tx_char.Value[i]);}GVariant *value = g_variant_builder_end(builder);g_variant_builder_unref(builder);GVariantBuilder *prop_builder = g_variant_builder_new(G_VARIANT_TYPE("a{sv}"));g_variant_builder_add(prop_builder, "{sv}", "Value", value);parameters[1] = g_variant_builder_end(prop_builder);g_variant_builder_unref(prop_builder);/** invalidated_properties*/GVariantBuilder *inv_prop_builder = g_variant_builder_new(G_VARIANT_TYPE("as"));parameters[2] = g_variant_builder_end(inv_prop_builder);g_variant_builder_unref(inv_prop_builder);GError *error = NULL;g_dbus_connection_emit_signal(server_ctx.conn,"org.bluez",UART_OBJECT_PATH"/service00/char0001","org.freedesktop.DBus.Properties","PropertiesChanged" ,g_variant_new_tuple(parameters, 3), /* (sa{sv}as) */&error);if(error) {u_tm_log("[%s:%d] error: %s\n", __FUNCTION__, __LINE__, error->message);g_error_free (error);} }static int gatt_create_node_info(void) {GError *error = NULL;server_ctx.object_manager_node_info = g_dbus_node_info_new_for_xml(object_manager_xml, &error);if(error) {u_tm_log("[%s:%d] error: %s\n", __FUNCTION__, __LINE__, error->message);g_error_free (error);return -1;}server_ctx.service_node_info = g_dbus_node_info_new_for_xml(service_xml, &error);if(error) {u_tm_log("[%s:%d] error: %s\n", __FUNCTION__, __LINE__, error->message);g_error_free (error);goto ERROR_1;}server_ctx.char_node_info = g_dbus_node_info_new_for_xml(char_xml, &error);if(error) {u_tm_log("[%s:%d] error: %s\n", __FUNCTION__, __LINE__, error->message);g_error_free (error);goto ERROR_2;}u_tm_log("[%s:%d] %s\n", __FUNCTION__, __LINE__, "gatt_create node info ok");return 0;ERROR_2:g_dbus_node_info_unref(server_ctx.service_node_info);ERROR_1:g_dbus_node_info_unref(server_ctx.object_manager_node_info);return -1;}static GVariant * get_property_variant(const gchar *object_path, const gchar *interface_name, const gchar *property_name) {GVariant *v = NULL;if(!strcmp(object_path, UART_OBJECT_PATH"/service00")) {if(!strcmp(property_name, "UUID")) {v = g_variant_new("s", server_ctx.gatt.service.UUID);} else if(!strcmp(property_name, "Primary")) {v = g_variant_new("b", server_ctx.gatt.service.Primary);}} else if(!strcmp(object_path, UART_OBJECT_PATH"/service00/char0000")) {if(!strcmp(property_name, "UUID")) {v = g_variant_new("s", server_ctx.gatt.rx_char.UUID);} else if(!strcmp(property_name, "Flags")) {GVariantBuilder *builder = g_variant_builder_new(G_VARIANT_TYPE("as"));int i;for(i = 0; i < CHAR_FLAGS_SIZE; i++) {if(server_ctx.gatt.rx_char.Flags[i])g_variant_builder_add(builder, "s", server_ctx.gatt.rx_char.Flags[i]);}v= g_variant_builder_end(builder);g_variant_builder_unref(builder);} else if(!strcmp(property_name, "Value")) {GVariantBuilder *builder = g_variant_builder_new(G_VARIANT_TYPE("ay"));int i;for(i = 0; i < server_ctx.gatt.rx_char.len; i++) {g_variant_builder_add(builder, "y", server_ctx.gatt.rx_char.Value[i]);}v= g_variant_builder_end(builder);g_variant_builder_unref(builder);} else if(!strcmp(property_name, "Service")) {v = g_variant_new("o", server_ctx.gatt.rx_char.Service);} else if(!strcmp(property_name, "Notifying")) {v = g_variant_new("b", server_ctx.gatt.rx_char.Notifying);}} else if(!strcmp(object_path, UART_OBJECT_PATH"/service00/char0001")) {if(!strcmp(property_name, "UUID")) {v = g_variant_new("s", server_ctx.gatt.tx_char.UUID);} else if(!strcmp(property_name, "Flags")) {GVariantBuilder *builder = g_variant_builder_new(G_VARIANT_TYPE("as"));int i;for(i = 0; i < CHAR_FLAGS_SIZE; i++) {if(server_ctx.gatt.tx_char.Flags[i])g_variant_builder_add(builder, "s", server_ctx.gatt.tx_char.Flags[i]);}v= g_variant_builder_end(builder);g_variant_builder_unref(builder);} else if(!strcmp(property_name, "Value")) {GVariantBuilder *builder = g_variant_builder_new(G_VARIANT_TYPE("ay"));int i;for(i = 0; i < server_ctx.gatt.tx_char.len; i++) {g_variant_builder_add(builder, "y", server_ctx.gatt.tx_char.Value[i]);}v= g_variant_builder_end(builder);g_variant_builder_unref(builder);} else if(!strcmp(property_name, "Service")) {v = g_variant_new("o", server_ctx.gatt.tx_char.Service);} else if(!strcmp(property_name, "Notifying")) {v = g_variant_new("b", server_ctx.gatt.tx_char.Notifying);}}return v;}/** type='a{oa{sa{sv}}}'*/ static GVariant *gatt_create_managed_objects(void) {GVariant *v_property, *v;GVariantBuilder *builder_if;GVariantBuilder *builder_obj;GVariantBuilder *builder_mobjs;int i;builder_mobjs = g_variant_builder_new(G_VARIANT_TYPE("a{oa{sa{sv}}}"));/** 構建/org/uart/server/service00的接口和屬性*/builder_if = g_variant_builder_new(G_VARIANT_TYPE("a{sv}"));v_property = get_property_variant(UART_OBJECT_PATH"/service00", "org.bluez.GattService1", "UUID");g_variant_builder_add(builder_if, "{&sv}", "UUID", v_property);v_property = get_property_variant(UART_OBJECT_PATH"/service00", "org.bluez.GattService1", "Primary");g_variant_builder_add(builder_if, "{&sv}", "Primary", v_property);v = g_variant_builder_end(builder_if);g_variant_builder_unref(builder_if);builder_obj = g_variant_builder_new(G_VARIANT_TYPE("a{sa{sv}}"));g_variant_builder_add(builder_obj, "{&s@a{sv}}", "org.bluez.GattService1", v);v = g_variant_builder_end(builder_obj);g_variant_builder_unref(builder_obj);g_variant_builder_add(builder_mobjs, "{&o@a{sa{sv}}}", UART_OBJECT_PATH"/service00", v);/** 構建/org/uart/server/service00/char0000的接口和屬性*/builder_if = g_variant_builder_new(G_VARIANT_TYPE("a{sv}"));const char *char0000_list[] = {"UUID", "Service", "Value", "Notifying", "Flags"};for(i = 0; i < sizeof(char0000_list)/sizeof(const char *); i++) {v_property = get_property_variant(UART_OBJECT_PATH"/service00/char0000", "org.bluez.GattCharacteristic1", char0000_list[i]);g_variant_builder_add(builder_if, "{&sv}", char0000_list[i], v_property);}v = g_variant_builder_end(builder_if);g_variant_builder_unref(builder_if);builder_obj = g_variant_builder_new(G_VARIANT_TYPE("a{sa{sv}}"));g_variant_builder_add(builder_obj, "{&s@a{sv}}", "org.bluez.GattCharacteristic1", v);v = g_variant_builder_end(builder_obj);g_variant_builder_unref(builder_obj);g_variant_builder_add(builder_mobjs, "{&o@a{sa{sv}}}", UART_OBJECT_PATH"/service00/char0000", v);/** 構建/org/uart/server/service00/char0001的接口和屬性*/builder_if = g_variant_builder_new(G_VARIANT_TYPE("a{sv}"));const char *char0001_list[] = {"UUID", "Service", "Value", "Notifying", "Flags"};for(i = 0; i < sizeof(char0001_list)/sizeof(const char *); i++) {v_property = get_property_variant(UART_OBJECT_PATH"/service00/char0001", "org.bluez.GattCharacteristic1", char0001_list[i]);g_variant_builder_add(builder_if, "{&sv}", char0001_list[i], v_property);}v = g_variant_builder_end(builder_if);g_variant_builder_unref(builder_if);builder_obj = g_variant_builder_new(G_VARIANT_TYPE("a{sa{sv}}"));g_variant_builder_add(builder_obj, "{&s@a{sv}}", "org.bluez.GattCharacteristic1", v);v = g_variant_builder_end(builder_obj);g_variant_builder_unref(builder_obj);g_variant_builder_add(builder_mobjs, "{&o@a{sa{sv}}}", UART_OBJECT_PATH"/service00/char0001", v);/** 構建GetManagedObjects返回值類型*/v = g_variant_builder_end(builder_mobjs);g_variant_builder_unref(builder_mobjs);GVariant *tuples[] = {v};return g_variant_new_tuple(tuples, 1); }static void uart_rx_callback(GVariant *params) { #ifdef __DEBUG__u_tm_log("params type: \"%s\"\n", g_variant_get_type_string(params)); #endif/** params type: "(aya{sv})"*/GVariant *value, *flags;g_variant_get(params, "(@ay@a{sv})", &value, &flags);u_tm_log("value type: \"%s\"\n", g_variant_get_type_string(value));u_tm_log("flags type: \"%s\"\n", g_variant_get_type_string(flags));GVariantIter *iter = g_variant_iter_new(value);/** 提取數據*/server_ctx.gatt.rx_char.len = 0;uint8_t *pdata = server_ctx.gatt.rx_char.Value;while(g_variant_iter_next(iter, "y", (pdata + server_ctx.gatt.rx_char.len))){server_ctx.gatt.rx_char.len++;}g_variant_iter_free(iter);#ifdef __DEBUG__u_tm_log("uart_rx_callback len: %d\n", server_ctx.gatt.rx_char.len);u_tm_log_hex("uart_rx_callback value: ", server_ctx.gatt.rx_char.Value, server_ctx.gatt.rx_char.len); #endif/** 將數據提供給回調函數*/if(server_ctx.gatt.rx_char.len && server_ctx.receive_cb_func) {server_ctx.receive_cb_func(server_ctx.gatt.rx_char.Value, server_ctx.gatt.rx_char.len);} }static void on_method_call(GDBusConnection *con,const gchar *sender,const gchar *obj_path,const gchar *iface_name,const gchar *method_name,GVariant *params,GDBusMethodInvocation *invoc,gpointer udata) { #ifdef __DEBUG__u_tm_log("[%s:%d] object_path :%s\n", __FUNCTION__, __LINE__, obj_path);u_tm_log("[%s:%d] iface_name :%s\n", __FUNCTION__, __LINE__, iface_name);u_tm_log("[%s:%d] method_name :%s\n", __FUNCTION__, __LINE__, method_name); #endifif(!strcmp(obj_path, UART_OBJECT_PATH)) {if(!strcmp(method_name, "GetManagedObjects")) {g_dbus_method_invocation_return_value(invoc, gatt_create_managed_objects());}} else if(!strcmp(obj_path, UART_OBJECT_PATH"/service00/char0000")) {/* Rx */if(!strcmp(method_name, "WriteValue")) {uart_rx_callback(params);}} else if(!strcmp(obj_path, UART_OBJECT_PATH"/service00/char0001")) {/* Tx */if(!strcmp(method_name, "StartNotify")) {server_ctx.gatt.tx_char.Notifying = 1;u_tm_log("Start server_ctx.gatt.tx_char.Notifying = %d\n", server_ctx.gatt.tx_char.Notifying);} else if(!strcmp(method_name, "StopNotify")) {server_ctx.gatt.tx_char.Notifying = 0;u_tm_log("Stop server_ctx.gatt.tx_char.Notifying = %d\n", server_ctx.gatt.tx_char.Notifying);}} }/** 如果interface info中有可讀的屬性存在,那么必須提供一個非空的get_property,* 或者在org.freedesktop.DBus.Properties接口上的method_call方法中實現Get和GetAll兩個函數.* */ static GVariant * get_property(GDBusConnection *connection,const gchar *sender,const gchar *object_path,const gchar *interface_name,const gchar *property_name,GError **error,gpointer user_data) { #ifdef __DEBUG__u_tm_log("[%s:%d] sender :%s\n", __FUNCTION__, __LINE__, sender);u_tm_log("[%s:%d] object_path :%s\n", __FUNCTION__, __LINE__, object_path);u_tm_log("[%s:%d] interface_name :%s\n", __FUNCTION__, __LINE__, interface_name);u_tm_log("[%s:%d] property_name :%s\n", __FUNCTION__, __LINE__, property_name); #endifGVariant *v = get_property_variant(object_path, interface_name, property_name);return v; }static int gatt_object_register(GDBusConnection *conn) {GError *error = NULL;GDBusInterfaceVTable interface_vtable;/** 這些回調函數的執行是依賴于g_main_loop的*/interface_vtable.method_call = on_method_call;interface_vtable.get_property = NULL; /*ObjectManager 不存在屬性*/interface_vtable.set_property = NULL;server_ctx.object_manager_reg_id = g_dbus_connection_register_object(conn,UART_OBJECT_PATH,server_ctx.object_manager_node_info->interfaces[0],/*org.freedesktop.DBus.ObjectManager*/&interface_vtable,NULL,NULL,&error);if(error) {u_tm_log("<org.freedesktop.DBus.ObjectManager> interface info register Error\n");u_tm_log("%s\n", error->message);g_error_free (error);return -1;}interface_vtable.method_call = on_method_call;interface_vtable.get_property = get_property;interface_vtable.set_property = NULL;server_ctx.service_reg_id = g_dbus_connection_register_object(conn,UART_OBJECT_PATH"/service00",server_ctx.service_node_info->interfaces[0],/*org.bluez.GattService1*/&interface_vtable,NULL,NULL,&error);if(error) {u_tm_log("<org.bluez.GattService1> interface info register Error\n");u_tm_log("%s\n", error->message);g_error_free (error);return -1;}server_ctx.rx_char_reg_id = g_dbus_connection_register_object(conn,UART_OBJECT_PATH"/service00/char0000",server_ctx.char_node_info->interfaces[0],/*org.bluez.GattCharacteristic1*/&interface_vtable,NULL,NULL,&error);if(error) {u_tm_log("<RX org.bluez.GattCharacteristic1> interface info register Error\n");u_tm_log("%s\n", error->message);g_error_free (error);return -1;}server_ctx.tx_char_reg_id = g_dbus_connection_register_object(conn,UART_OBJECT_PATH"/service00/char0001",server_ctx.char_node_info->interfaces[0],/*org.bluez.GattCharacteristic1*/&interface_vtable,NULL,NULL,&error);if(error) {u_tm_log("<TX org.bluez.GattCharacteristic1> interface info register Error\n");u_tm_log("%s\n", error->message);g_error_free (error);return -1;}u_tm_log("[%s:%d] %s\n", __FUNCTION__, __LINE__, "gatt object register ok");return 0; }static void async_ready_callback(GObject *source_object,GAsyncResult *res,gpointer user_data) {GDBusConnection *conn = (GDBusConnection *)user_data;GError *error = NULL;g_dbus_connection_call_finish (conn,res,&error);if(error) {u_tm_log("Error: RegisterApplication %s\n", error->message);g_error_free (error);return;}u_tm_log("async_ready_callback: uart_register_application ok \n"); }static void uart_register_application_async(GDBusConnection *conn) {GVariant *parameters;GVariant *vobject_path = g_variant_new("o", UART_OBJECT_PATH);GVariantBuilder *dict_builder = g_variant_builder_new(G_VARIANT_TYPE("a{sv}"));GVariant *dict_v = g_variant_builder_end(dict_builder);g_variant_builder_unref(dict_builder);GVariant *children[] = {vobject_path, dict_v};parameters = g_variant_new_tuple(children, 2);g_dbus_connection_call (conn,"org.bluez","/org/bluez/hci0","org.bluez.GattManager1","RegisterApplication",parameters,NULL,G_DBUS_CALL_FLAGS_NONE,-1,NULL,async_ready_callback,conn); }int gatt_uart_server_start(GDBusConnection *conn) {gatt_create_node_info();gatt_object_register(conn);uart_register_application_async(conn);server_ctx.conn = conn;return 0; }

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