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实际使用中，会用到MTU修改，修改后查看本次连接的MTU值是多少，现在举例(simple工程)查看MTU修改和查看MTU值 1）在下面函数中，添加update mtu static int gapc_connection_req_ind_handler(ke_msg_id_t const msgid, struct gapc_connection_req_ind const *param, ke_task_id_t const dest_id, ke_task_id_t const src_id) { app_env.conidx = KE_IDX_GET(src_id); #if (BLE_APP_SEC) bool is_bond = app_sec_get_bond_status_by_addr(param->peer_addr); #endif log_debug("Device type(%d) conidx(%d) connected, ", param->peer_addr_type, app_env.conidx); log_debug_array_ex("ADDR", ¶m->peer_addr, 6); // Check if the received Connection Handle was valid if (app_env.conidx != GAP_INVALID_CONIDX) { // Retrieve the connection info from the parameters app_env.conhdl = param->conhdl; // Send connection confirmation struct gapc_connection_cfm *cfm = KE_MSG_ALLOC(GAPC_CONNECTION_CFM, KE_BUILD_ID(TASK_GAPC, app_env.conidx), TASK_APP, gapc_connection_cfm); #if (BLE_APP_SEC) cfm->auth = is_bond ? GAP_AUTH_REQ_NO_MITM_BOND : GAP_AUTH_REQ_NO_MITM_NO_BOND; // TODO [FBE] restore valid data #else // !(BLE_APP_SEC) cfm->auth = GAP_AUTH_REQ_NO_MITM_NO_BOND; #endif // (BLE_APP_SEC) // Send the message ke_msg_send(cfm); /*-------------------------------------------------------------- * ENABLE REQUIRED PROFILES *--------------------------------------------------------------*/ #if (BLE_APP_BATT) // Enable Battery Service app_batt_enable_prf(app_env.conidx); #endif //(BLE_APP_BATT) #if (BLE_APP_SIMPLE_SERVER) // Enable SIMPLE_SERVER Service app_simple_server_enable_prf(app_env.conidx); #endif //(BLE_APP_SIMPLE_SERVER) // We are now in connected State ke_state_set(dest_id, APPM_CONNECTED); #if (BLE_APP_SEC) if (is_bond) { // Ask for the peer device to either start encryption app_sec_send_security_req(app_env.conidx); } #endif // (BLE_APP_SEC) // Update mtu { uint8_t conidx = KE_IDX_GET(src_id); struct gattc_exc_mtu_cmd *mtu_cmd = KE_MSG_ALLOC_DYN(GATTC_EXC_MTU_CMD, KE_BUILD_ID(TASK_GATTC, conidx), dest_id, gattc_exc_mtu_cmd, 0); mtu_cmd->operation = GATTC_MTU_EXCH; // Send message ke_msg_send(mtu_cmd); } } else { // No connection has been established, restart advertising // appm_adv_update_state(true); appm_adv_start(); } return (KE_MSG_CONSUMED); } 2) 增加 {GATTC_MTU_CHANGED_IND, (ke_msg_func_t)gattc_mtu_changed_ind_handler}, // mtu change handle /**< Default State handlers definition. */ KE_MSG_HANDLER_TAB(appm){ // Note: first message is latest message checked by kernel so default is put on top. {KE_MSG_DEFAULT_HANDLER, (ke_msg_func_t)appm_msg_handler}, // GAPM messages {GAPM_PROFILE_ADDED_IND, (ke_msg_func_t)gapm_profile_added_ind_handler}, {GAPM_ACTIVITY_CREATED_IND, (ke_msg_func_t)gapm_activity_created_ind_handler}, {GAPM_ACTIVITY_STOPPED_IND, (ke_msg_func_t)gapm_activity_stopped_ind_handler}, {GAPM_CMP_EVT, (ke_msg_func_t)gapm_cmp_evt_handler}, {GAPM_GEN_RAND_NB_IND, (ke_msg_func_t)gapm_gen_rand_nb_ind_handler}, {GAPM_LIST_SIZE_IND, (ke_msg_func_t)gapm_list_size_ind_handler}, {GAPM_DEV_BDADDR_IND, (ke_msg_func_t)gapm_dev_bdaddr_ind_handler}, // GAPC messages {GAPC_GET_DEV_INFO_REQ_IND, (ke_msg_func_t)gapc_get_dev_info_req_ind_handler}, {GAPC_SET_DEV_INFO_REQ_IND, (ke_msg_func_t)gapc_set_dev_info_req_ind_handler}, {GAPC_CONNECTION_REQ_IND, (ke_msg_func_t)gapc_connection_req_ind_handler}, {GAPC_CMP_EVT, (ke_msg_func_t)gapc_cmp_evt_handler}, {GAPC_DISCONNECT_IND, (ke_msg_func_t)gapc_disconnect_ind_handler}, {GAPC_PARAM_UPDATE_REQ_IND, (ke_msg_func_t)gapc_param_update_req_ind_handler}, // gattc message {GATTC_MTU_CHANGED_IND, (ke_msg_func_t)gattc_mtu_changed_ind_handler}, // mtu change handle }; 3）增加对应回调函数 static int gattc_mtu_changed_ind_handler(ke_msg_id_t const msgid, struct gattc_mtu_changed_ind *param, ke_task_id_t const dest_id, ke_task_id_t const src_id) { // log_debug("%s@%d\n", __func__, __LINE__); uint8_t conidx = KE_IDX_GET(src_id); log_debug("conidx=%x,mtu=%d\n", conidx, param->mtu); { // tspp_server_set_max_mtu(conidx, param->mtu); } return KE_MSG_CONSUMED; } 4）连上手机后打印如下：
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