pem_read_block
result = pem_read_block(client, PEM_READ_DATA_STRING,
result = pem_read_block(client, PEM_READ_INPUT_STRING,
result = pem_read_block(client, PEM_READ_FAN_SPEED,
ret = pem_read_block(client, PEM_READ_FIRMWARE_REV,
ret = pem_read_block(client, PEM_READ_INPUT_STRING,
ret = pem_read_block(client, PEM_READ_INPUT_STRING,
ret = pem_read_block(client, PEM_READ_FAN_SPEED,