Improbe ADV Manufacturer Data (correction)

gap.go

@@ -387,7 +387,7 @@ func (buf *rawAdvertisementPayload) addServiceUUID(uuid UUID) (ok bool) {
 	// Don't bother with 32-bit UUID support, it doesn't seem to be used in
 	// practice.
 	if uuid.Is16Bit() {
-		if int(buf.len)+4 > len(buf.data) {
+		if int(buf.scanlen)+4 > len(buf.scandata) {
 			return false // UUID doesn't fit.
 		}
 		shortUUID := uuid.Get16Bit()
@@ -395,7 +395,7 @@ func (buf *rawAdvertisementPayload) addServiceUUID(uuid UUID) (ok bool) {
 		buf.scandata[buf.scanlen+1] = 0x03 // type, 0x03 means "Complete List of 16-bit Service Class UUIDs"
 		buf.scandata[buf.scanlen+2] = byte(shortUUID)
 		buf.scandata[buf.scanlen+3] = byte(shortUUID >> 8)
-		buf.len += 4
+		buf.scanlen += 4
 		return true
 	} else {
 		if int(buf.len)+18 > len(buf.data) {
@@ -405,7 +405,7 @@ func (buf *rawAdvertisementPayload) addServiceUUID(uuid UUID) (ok bool) {
 		buf.scandata[buf.scanlen+1] = 0x07 // type, 0x07 means "Complete List of 128-bit Service Class UUIDs"
 		rawUUID := uuid.Bytes()
 		copy(buf.scandata[buf.scanlen+2:], rawUUID[:])
-		buf.len += 18
+		buf.scanlen += 18
 		return true
 	}
 }