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Shoichi Sakane 2017-09-23 21:43:30 +09:00
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lorawan_toa
===========
LoRa Time on Air calculator
===========================
A calculator of the time on air of LoRa PHY frame in Python.
This script refers to the section 4.1.1.6. LoRa Packet Structure,
@ -7,13 +7,43 @@ This script refers to the section 4.1.1.6. LoRa Packet Structure,
## Usage
Usage: lorawan_toa.py (sf) (size) [bw] [de]
size: PHY Payload siz (= MAC Payload + 5)
bw: bandwidth. default is 125 kHz.
de: low data optimization. default is 0.
lorawan_toa.py [-h] [--band-width N_BW] [--disable-dro] [--disable-eh]
[--cr N_CR] [--preamble N_PREAMBLE] [-v] [-d]
SF SIZE
positional arguments:
SF Spreading Factor. It should be from 7 to 12.
SIZE PHY payload size in byte. It's equal to the MAC
payload + 5.
optional arguments:
-h, --help show this help message and exit
--band-width N_BW bandwidth in kHz. default is 125 kHz.
--disable-dro disable the low data rate optimization. default is
enable as LoRaWAN does.
--disable-eh disable the explicit header. default is enable as
LoRaWAN does.
--cr N_CR specify the CR value. default is 1 as LoRaWAN does.
--preamble N_PREAMBLE
specify the preamble. default is 8 for AS923.
-v enable verbose mode.
-d increase debug mode.
% python lorawan_toa.py 12 64 500
616.448 (ms)
## Examples
% python lorawan_toa.py -v 12 64
PHY payload size : 64 Bytes
MAC payload size : 59 Bytes
Spreading Factor : 12
Band width : 125 kHz
Low data rate opt.: enable
Explicit header : enable
CR (coding rate) : 1 (4/5)
Preamble size : 8 symbols
Time on Air : 2793.472 msec
% python lorawan_toa.py --band-width=500 7 128
71.744
## graph_as923.py