long write: receiving partial data only

[yacine]

hello,

I'm trying to send long (73B) data on a given characteristic using Android client as the central.

I well received:

• USER_MEM_REQUEST OK

>     #define BLE_TDS_MAX_LONG_WRITE    256

> case BLE_EVT_USER_MEM_REQUEST:

    >     > 		NRF_LOG_DEBUG("BLE_EVT_USER_MEM_REQUEST\r\n");
    >     > 
    >     > 		mem_buffer.len = BLE_TDS_MAX_LONG_WRITE;
    >     > 		mem_buffer.p_mem = (uint8_t *) malloc(BLE_TDS_MAX_LONG_WRITE);
    >     > 
    >     > 		uint32_t err_code = sd_ble_user_mem_reply(p_tds->conn_handle, &mem_buffer);

• BLE_GATTS_OP_EXEC_WRITE_REQ_NOW

  	case BLE_GATTS_OP_EXEC_WRITE_REQ_NOW:
  		NRF_LOG_DEBUG("BLE_GATTS_OP_EXEC_WRITE_REQ_NOW\r\n");
  
  		handle = *(uint16_t*) mem_buffer.p_mem;
  //		offset = *(uint16_t*) (mem_buffer.p_mem+2);
  		len = *(uint16_t*) (mem_buffer.p_mem+4);
  		buffer = (uint8_t *) (mem_buffer.p_mem+6);
  

when reading mem_buffer, the handle is correct but the len is only 18 bytes.

NB: the first 18B in the buffer are correct.

And I dont understand why I dont see the intermediate BLE_GATTS_OP_WRITE_REQ

[yacine]

the char description:

static uint32_t schedule_cal_char_add(ble_tds_t * p_tds, const ble_tds_init_t * p_tds_init){    
            	ble_gatts_char_md_t char_md;
            	ble_gatts_attr_t    attr_char_value;
            	ble_uuid_t          ble_uuid;
            	ble_gatts_attr_md_t attr_md;
            
            	memset(&char_md, 0, sizeof(char_md));
            	char_md.char_props.write         	= 1; 
                    char_md.char_props.notify         	= 1;
            	char_md.p_char_user_desc         	= NULL;
            	char_md.p_char_pf                	= NULL;
            	char_md.p_user_desc_md           	= NULL;
            	char_md.p_cccd_md         			= NULL;
            	char_md.p_sccd_md                	= NULL;
            
            	memset(&ble_uuid, 0, sizeof(ble_uuid));
            	ble_uuid.type = p_tds->uuid_type;
            	ble_uuid.uuid = BLE_UUID_TDS_SCHEDULE_CAL_CHAR;
            
            	memset(&attr_md, 0, sizeof(attr_md));
            	BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
            	BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);
            	attr_md.vloc    					= BLE_GATTS_VLOC_STACK;
            	attr_md.rd_auth 					= 0;
            	attr_md.wr_auth    					= 0;
                attr_md.vlen       					= 1;
            
            	memset(&attr_char_value, 0, sizeof(attr_char_value));
            	attr_char_value.p_uuid    = &ble_uuid;
            	attr_char_value.p_attr_md = &attr_md;
            	attr_char_value.init_len  = 0;
            	attr_char_value.init_offs = 0;
            	attr_char_value.max_len   = BLE_TDS_MAX_LONG_WRITE;
            
            	return sd_ble_gatts_characteristic_add(p_tds->service_handle,
            			&char_md,
            			&attr_char_value,
            			&p_tds->schedule_cal_handles);
            }