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Version 7.3 by Xiaoling on 2022/09/26 11:27
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1 = Overview: =
2
3 This instruction is for how to use Peer to Peer firmware in LA66.
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5
6 = Firmware Location: =
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8 Click[[ here>>https://www.dropbox.com/sh/dq03kkfdrqnhy66/AACpHIcKYMa4o1IySKtVoeENa?dl=0]] to download the firmware and update it to LA66 according to the instruction for different boards.
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10
11 = How to use? =
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13
14
15 == 1. AT command： ==
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17
18 (% style="color:blue" %)**1) Lora parameter configuration:**
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20 AT+FRE: Get or Set TX and RX frequency
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22 AT+BW: Get or Set TX and RX BandWidth
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24 AT+SF: Get or Set TX and RX Spreading Factor
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26 AT+POWER: Get or Set Tx Power Range
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28 AT+CRC: Get or Set TX and RX CRC Type
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30 AT+HEADER: Get or Set TX and RX Header Type
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32 AT+CR: Get or Set TX and RX Header Type
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34 AT+IQ: Get or Set TX and RX InvertIQ
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36 AT+PREAMBLE: Get or Set TX and RX Preamble Length
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38 AT+SYNCWORD: Get or Set sync word
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40
41 (% style="color:blue" %)**2) General configuration:**
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43 ATZ: Trig a reset of the MCU
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45 AT+FDR: Reset Parameters to Factory Default
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47 AT+CFG: Print all configurations
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49 AT+FCU: Get or Set the Frame Counter Uplink
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51 AT+FCD: Get or Set the Frame Counter Downlink
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53 AT+GROUPMOD: Get or Set TX and RX group
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55 AT+RXMOD: Get or Set Rx Timeout and Reply mode
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57 AT+SEND: Send text data or hex along with the application port and confirm status
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59 AT+RECV: Print last receive message, RSSI and SNR
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61
62
63 == 2. Serial port information ==
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66 (% style="color:blue" %)**1) Information initialized at reset：**
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68 [[image:image-20220926112125-1.png]]
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71 (% style="color:blue" %)**2) In retransmission, the Uplinkcounter does not accumulate. The following figure shows that the third count packet is retransmitted twice when the ACK packet is not received.**
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74 [[image:image-20220926112125-2.png]]
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77 (% style="color:blue" %)**3) In the figure below, the receiver sends an ACK to the sender after receiving the packet, and the sender stops retransmission after receiving the ACK.**
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80 (% style="color:red" %)**Receiver: (configured as AT+RXMOD=65535,2)**
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82 [[image:image-20220926112125-3.png]]
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86 (% style="color:red" %)**Sender:**
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88 [[image:image-20220926112125-4.png]]
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92
93 == 3. Data Format: ==
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96 1 byte of TXGROUPMOD +n payload + 4 bytes of checksum
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99 Payload(S12, SF11, SF10 maximum length is 59, SF9 maximum length is 123, SF8, SF7 maximum length is 230):
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101 (% border="1" style="background-color:#ffffcc; color:green; width:316px" %)
102 |=(% style="width: 105px;" %)**Size (bytes)**|=(% style="width: 109px;" %)**1**|=(% style="width: 99px;" %)**payloadsize**
103 |(% style="width:105px" %)**Value**|(% style="width:109px" %)TXGroupmod|(% style="width:99px" %)Send data
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107
108 = AT Command Set. =
109
110 == Set TX and RX Bandwidth ==
111
112 Set TX and RX BandWidth (0 ~~ 9)
113 0: 125 kHz
114 1: 250 kHz
115 2: 500 kHz
116 3: 62.5 kHz
117 4: 41.67 kHz
118 5: 31.25 kHz
119 6: 20.83 kHz
120 7: 15.63 kHz
121 8: 10.42 kHz
122 9: 7.81 kHz
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125 Default Value: AT+BW=0,0 ~/~/ BandWidth: 125kHz ,125kHz
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127 Range: (0 ~~ 9)
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