Hi ! I have a rather strange problem: 1 packet is transmitted for 30 milliseconds. I use iPhone-4s with iOS8.1 and custom board with nRF51822
In the firmware exists 4 characteristics: 2 - for receive data and 2 - for send. Here are settings nRF51822:
#define MIN_CONN_INTERVAL MSEC_TO_UNITS(7.5, UNIT_1_25_MS)
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(30, UNIT_1_25_MS)
#define SLAVE_LATENCY 0
#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(6000, UNIT_10_MS)
This is a peace of sniffer log:
8948 85.417583000 Master Slave ATT 37 Rcvd Write Request, Handle: 0x000d
8949 85.421619000 Slave Master LE LL 26 Empty PDU
8950 85.433200000 Master Slave LE LL 26 Empty PDU
8951 85.437236000 Slave Master ATT 31 Rcvd Write Response
8952 85.463725000 Master Slave LE LL 26 Empty PDU
8953 85.468043000 Slave Master LE LL 26 Empty PDU
8954 85.494057000 Master Slave ATT 53 Rcvd Write Request, Handle: 0x000b
8955 85.497949000 Slave Master LE LL 26 Empty PDU
8956 85.523015000 Master Slave LE LL 26 Empty PDU
8957 85.526956000 Slave Master ATT 31 Rcvd Write Response
8958 85.554217000 Master Slave ATT 53 Rcvd Write Request, Handle: 0x000b
8959 85.558422000 Slave Master LE LL 26 Empty PDU
8960 85.583096000 Master Slave LE LL 26 Empty PDU
8961 85.595372000 Slave Master ATT 31 Rcvd Write Response
8962 85.613820000 Master Slave ATT 47 Rcvd Write Request, Handle: 0x000b
8963 85.617672000 Slave Master LE LL 26 Empty PDU
8964 85.643008000 Master Slave LE LL 26 Empty PDU
8965 85.646893000 Slave Master ATT 31 Rcvd Write Response
8966 85.673532000 Master Slave LE LL 26 Empty PDU
8967 85.677629000 Slave Master LE LL 26 Empty PDU
8968 85.703538000 Master Slave LE LL 26 Empty PDU
8969 85.707800000 Slave Master LE LL 26 Empty PDU
8970 85.733147000 Master Slave LE LL 26 Empty PDU
8971 85.737248000 Slave Master ATT 37 Rcvd Handle Value Indication, Handle: 0x0012
8972 85.763800000 Master Slave ATT 31 Rcvd Handle Value Confirmation
8973 85.767446000 Slave Master LE LL 26 Empty PDU
8974 85.793250000 Master Slave LE LL 26 Empty PDU
8975 85.798415000 Slave Master ATT 53 Rcvd Handle Value Indication, Handle: 0x000f
8976 85.823191000 Master Slave ATT 31 Rcvd Handle Value Confirmation
8977 85.827331000 Slave Master LE LL 26 Empty PDU
8978 85.853193000 Master Slave LE LL 26 Empty PDU
8979 85.858211000 Slave Master ATT 53 Rcvd Handle Value Indication, Handle: 0x000f
8980 85.883920000 Master Slave ATT 31 Rcvd Handle Value Confirmation
8981 85.887678000 Slave Master LE LL 26 Empty PDU
8982 85.913133000 Master Slave LE LL 26 Empty PDU
8983 85.917839000 Slave Master ATT 47 Rcvd Handle Value Indication, Handle: 0x000f
8984 85.944011000 Master Slave ATT 31 Rcvd Handle Value Confirmation
8985 85.947797000 Slave Master LE LL 26 Empty PDU
As we see bettwen master-request and slave-responce passes ~30 milliseconds such between 8948 and 8951 packets. Each packet have len=20 byte and 0.5 second by transmit 60 byte to one side and 60 byte to back :).
P.S. bettwen packets 8965 and 8971 the nRF have some work.
Who would be able to explain why such a low speed?
Thanks!
