MAX_CUSTOM_LEN
p += scnprintf(p, MAX_CUSTOM_LEN - (p - custom),
p += scnprintf(p, MAX_CUSTOM_LEN - (p - custom), " Channel flags: ");
p += scnprintf(p, MAX_CUSTOM_LEN - (p - custom), "INVALID ");
p += scnprintf(p, MAX_CUSTOM_LEN - (p - custom), "DFS ");
char custom[MAX_CUSTOM_LEN];