LAUNCHXL-CC1352P: Sub1 Not being able to send data fast enough

Nadeeem Jamal

Part Number: LAUNCHXL-CC1352P

Hello Marie,

I managed to make progress with the packet sniffer, specifically on the 200 kbps setting. I'll be sending you some packets for your review soon.

We're employing the standard TI 15.4 stack, operating in Frequency Hopping mode within the 902.2 to 915 MHz range. Our primary objective is achieving efficient file transfers. Strangely, we're encountering a challenge with achieving satisfactory throughput. While using SmartRF Studio, we can send data at a reasonably good rate, around 6KB in 8 seconds. However, when we attempt to implement the same in our code, we're only achieving 2.5KB in 60 seconds.

We're somewhat perplexed about where we might be going wrong. Logically, even if we assume a data transfer rate of 50 kbps, that should be more than sufficient. Even if we allocate half of that throughput for errors and overhead:

50,000 bits / 8 = 6.25 KB per second.

Furthermore, if we assume a 1/3 data transfer throughput, 2.5 KB should take a maximum of 2 seconds. Could you kindly provide some guidance on what we might be missing?

Our current approach involves breaking down the data we need to transfer into smaller 64-byte packets, and we're using the sendmessage function.

Best regards,

over 2 years ago

0 Marie H over 2 years ago

TI__Guru* 82531 points

Hi Nadeem,

With SmartRF Studio you can send packets back-to-back, while the TI 15.4-Stack examples have to schedule the packets according to the spec, send/receive ACK packets etc. Using a Packet Sniffer or Logic analyzer you can see how often a packet is being transmitted. Also for frequency hopping mode, the devices hop between frequencies and for each hop they need to run the frequency synth (CMD_FS), so there is more overhead.

What reporting/polling interval are you using when scheduling the packets?

Cheers,

Marie H

0 Nadeeem Jamal over 2 years ago in reply to Marie H

Prodigy 80 points

I set the report interval to 3000 for our file transfer mechanism.

Now I am testing with basic out of the box dmm_15.4 sensor and collector example in non beacon mode. The only thing I changed is the datarate to 200 kbps.

I see allot of bad FCS, not sure what all this sniffer data means(I tried sniffing at 50 kbps, but i cant seem to get the sniffer to work at 50kbps 902Freq range, not sure what I am doing wrong) The funny thing is the sensor message data is coming through although there are soo many BAD FCS ...

1 0.000000 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
2 0.002240 IEEE 802.15.4 53 Ack, Bad FCS
3 0.007828 0xaabb 0x0004 IEEE 802.15.4 78 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
4 1.064207 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
5 1.069252 IEEE 802.15.4 53 Ack, Bad FCS
6 2.001038 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
7 2.003284 IEEE 802.15.4 53 Ack, Bad FCS
8 2.007828 0xaabb 0x0004 IEEE 802.15.4 78 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
9 4.003077 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
10 4.005319 IEEE 802.15.4 53 Ack, Bad FCS
11 4.012405 0xaabb 0x0004 IEEE 802.15.4 78 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
12 4.058375 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
13 4.063419 IEEE 802.15.4 53 Ack, Bad FCS
14 6.003044 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
15 6.005287 IEEE 802.15.4 53 Ack, Bad FCS
16 7.058799 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
17 7.063841 IEEE 802.15.4 53 Ack, Bad FCS
18 7.998832 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
19 8.001075 IEEE 802.15.4 53 Ack, Bad FCS
20 10.001942 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
21 10.004185 IEEE 802.15.4 53 Ack, Bad FCS
22 10.009763 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
23 10.059194 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
24 10.064238 IEEE 802.15.4 53 Ack, Bad FCS
25 11.997088 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
26 11.999334 IEEE 802.15.4 53 Ack, Bad FCS
27 12.003345 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
28 13.059646 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
29 13.064690 IEEE 802.15.4 53 Ack, Bad FCS
30 14.003526 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
31 14.005825 IEEE 802.15.4 53 Ack, Bad FCS
32 14.013795 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
33 15.999738 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
34 16.002083 IEEE 802.15.4 53 Ack, Bad FCS
35 16.004796 0xaabb 0x0004 IEEE 802.15.4 78 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
36 16.057998 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
37 16.063036 IEEE 802.15.4 53 Ack, Bad FCS
38 18.001810 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
39 18.004056 IEEE 802.15.4 53 Ack, Bad FCS
40 18.009620 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
41 19.058449 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
42 19.063493 IEEE 802.15.4 53 Ack, Bad FCS
43 19.997598 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
44 19.999843 IEEE 802.15.4 53 Ack, Bad FCS
45 20.005412 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
46 21.997566 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
47 21.999814 IEEE 802.15.4 53 Ack, Bad FCS
48 22.007437 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
49 22.057838 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
50 22.062881 IEEE 802.15.4 53 Ack, Bad FCS
51 24.000675 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
52 24.002918 IEEE 802.15.4 53 Ack, Bad FCS
53 25.058291 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
54 25.063334 IEEE 802.15.4 53 Ack, Bad FCS
55 26.002717 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
56 26.004965 IEEE 802.15.4 53 Ack, Bad FCS
57 26.010517 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
58 27.999585 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
59 28.001826 IEEE 802.15.4 53 Ack, Bad FCS
60 28.009940 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
61 28.060820 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
62 28.065861 IEEE 802.15.4 53 Ack, Bad FCS
63 29.998471 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
64 30.000716 IEEE 802.15.4 53 Ack, Bad FCS
65 30.007321 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
66 31.058130 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
67 31.063205 IEEE 802.15.4 53 Ack, Bad FCS
68 31.998438 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
69 32.000715 IEEE 802.15.4 53 Ack, Bad FCS
70 32.006287 0xaabb 0x0004 IEEE 802.15.4 78 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
71 33.996332 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
72 33.998578 IEEE 802.15.4 53 Ack, Bad FCS
73 34.004643 0xaabb 0x0004 IEEE 802.15.4 78 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
74 34.061670 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
75 34.066715 IEEE 802.15.4 53 Ack, Bad FCS
76 35.997336 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
77 35.999576 IEEE 802.15.4 53 Ack, Bad FCS
78 36.007694 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
79 37.059008 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
80 37.064053 IEEE 802.15.4 53 Ack, Bad FCS
81 37.998340 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
82 38.000581 IEEE 802.15.4 53 Ack, Bad FCS
83 38.005104 0xaabb 0x0004 IEEE 802.15.4 78 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
84 39.996231 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
85 39.998473 IEEE 802.15.4 53 Ack, Bad FCS
86 40.001979 0xaabb 0x0004 IEEE 802.15.4 78 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
87 40.060502 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
88 40.065541 IEEE 802.15.4 53 Ack, Bad FCS
89 41.997236 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
90 41.999505 IEEE 802.15.4 53 Ack, Bad FCS
91 42.003004 0xaabb 0x0004 IEEE 802.15.4 78 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
92 43.060954 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
93 43.065993 IEEE 802.15.4 53 Ack, Bad FCS
94 43.998272 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
95 44.000515 IEEE 802.15.4 53 Ack, Bad FCS
96 45.997171 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
97 45.999414 IEEE 802.15.4 53 Ack, Bad FCS
98 46.060875 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
99 46.065917 IEEE 802.15.4 53 Ack, Bad FCS
100 48.000678 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
101 48.002927 IEEE 802.15.4 53 Ack, Bad FCS
102 48.009544 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
103 49.062870 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
104 49.067913 IEEE 802.15.4 53 Ack, Bad FCS
105 50.002322 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
106 50.004569 IEEE 802.15.4 53 Ack, Bad FCS
107 50.011164 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
108 52.001251 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
109 52.003498 IEEE 802.15.4 53 Ack, Bad FCS
110 52.006467 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
111 52.061758 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
112 52.066802 IEEE 802.15.4 53 Ack, Bad FCS
113 53.996001 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
114 53.998241 IEEE 802.15.4 53 Ack, Bad FCS
115 54.004886 0xaabb 0x0004 IEEE 802.15.4 78 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
116 55.061671 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
117 55.066713 IEEE 802.15.4 53 Ack, Bad FCS
118 56.000150 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
119 56.002392 IEEE 802.15.4 53 Ack, Bad FCS
120 56.009006 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
121 58.002191 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
122 58.004433 IEEE 802.15.4 53 Ack, Bad FCS
123 58.008979 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
124 58.057887 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
125 58.062933 IEEE 802.15.4 53 Ack, Bad FCS
126 59.998009 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
127 60.000249 IEEE 802.15.4 53 Ack, Bad FCS
128 60.003185 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
129 61.063557 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
130 61.068594 IEEE 802.15.4 53 Ack, Bad FCS
131 62.002126 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
132 62.004366 IEEE 802.15.4 53 Ack, Bad FCS
133 62.015085 0xaabb 0x0004 IEEE 802.15.4 78 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
134 63.995837 0x0004 0xaabb IEEE 802.15.4 60 Data Request, Bad FCS
135 63.998079 IEEE 802.15.4 53 Ack, Bad FCS
136 64.006211 0xaabb 0x0004 IEEE 802.15.4 88 Data, Dst: 0x0004, Src: 0xaabb, Bad FCS
137 64.059803 0x0004 0xaabb IEEE 802.15.4 130 Data, Dst: 0xaabb, Src: 0x0004, Bad FCS
138 64.064850 IEEE 802.15.4 53 Ack, Bad FCS

0 Marie H over 2 years ago in reply to Nadeeem Jamal

TI__Guru* 82531 points

Hi Nadeem,

The Bad FCS messages are coming from the sniffer. Since the packets are being ACKed there is no reason to think that there is something wrong with them.

First of all, if you want the device to send as many packets as possible you need to queue as many packets as possible. I would recommend experimenting with different values, but getting to queueing the packages with a low interval will be key.

Since you're using DMM you will also "loose" some radio time to BLE operations.

Cheers,

Marie H

Sub-1 GHz

Sub-1 GHz forum

LAUNCHXL-CC1352P: Sub1 Not being able to send data fast enough