for (j = 0; j < sizeof(buffer); j += sizeof(buffer)/7) {
unsigned int len = sizeof(buffer)/7;
if (j + len > sizeof(buffer))
len = sizeof(buffer) - j;
for (j = 0; j < sizeof(buffer); j += sizeof(buffer)/7) {
unsigned int len = sizeof(buffer)/7;
if (j + len > sizeof(buffer))
len = sizeof(buffer) - j;