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Version 7.4 by Xiaoling on 2022/09/26 11:34
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1 = 1.  Overview: =
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4 This instruction is for how to use Peer to Peer firmware in LA66.
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7 = 2.  Firmware Location: =
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10 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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13 = 3.  How to use? =
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17 == 3.1  AT command： ==
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20 (% style="color:blue" %)**1). Lora parameter configuration:**
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23 AT+FRE:  Get or Set TX and RX frequency
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25 AT+BW:  Get or Set TX and RX BandWidth
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27 AT+SF:  Get or Set TX and RX Spreading Factor
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29 AT+POWER:  Get or Set Tx Power Range
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31 AT+CRC:  Get or Set TX and RX CRC Type
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33 AT+HEADER:  Get or Set TX and RX Header Type
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35 AT+CR:  Get or Set TX and RX Header Type
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37 AT+IQ:  Get or Set TX and RX InvertIQ
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39 AT+PREAMBLE:  Get or Set TX and RX Preamble Length
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41 AT+SYNCWORD:  Get or Set sync word
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45 (% style="color:blue" %)**2). General configuration:**
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48 ATZ:  Trig a reset of the MCU
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50 AT+FDR:  Reset Parameters to Factory Default
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52 AT+CFG:  Print all configurations
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54 AT+FCU:  Get or Set the Frame Counter Uplink
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56 AT+FCD:  Get or Set the Frame Counter Downlink
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58 AT+GROUPMOD:  Get or Set TX and RX group
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60 AT+RXMOD:  Get or Set Rx Timeout and Reply mode
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62 AT+SEND:  Send text data or hex along with the application port and confirm status
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64 AT+RECV:  Print last receive message, RSSI and SNR
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68 == 3.2  Serial port information ==
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71 (% style="color:blue" %)**1). Information initialized at reset：**
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73 [[image:image-20220926112125-1.png]]
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76 (% 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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79 [[image:image-20220926112125-2.png]]
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82 (% 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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85 (% style="color:red" %)**Receiver: (configured as AT+RXMOD=65535,2)**
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87 [[image:image-20220926112125-3.png]]
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91 (% style="color:red" %)**Sender:**
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93 [[image:image-20220926112125-4.png]]
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97 == 3.3  Data Format: ==
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100 1 byte of TXGROUPMOD +n payload + 4 bytes of checksum
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103 Payload(S12, SF11, SF10 maximum length is 59, SF9 maximum length is 123, SF8, SF7 maximum length is 230):
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105 (% border="1" style="background-color:#ffffcc; color:green; width:316px" %)
106 |=(% style="width: 105px;" %)**Size (bytes)**|=(% style="width: 109px;" %)**1**|=(% style="width: 99px;" %)**payloadsize**
107 |(% style="width:105px" %)**Value**|(% style="width:109px" %)TXGroupmod|(% style="width:99px" %)Send data
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111 = 4.  AT Command Set: =
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114 == 4.1  Set TX and RX Bandwidth ==
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117 (% style="color:blue" %)**Set TX and RX BandWidth (0 ~~ 9):**
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120 **0:  125 kHz
121 1:  250 kHz
122 2:  500 kHz
123 3:  62.5 kHz
124 4:  41.67 kHz
125 5:  31.25 kHz
126 6:  20.83 kHz
127 7:  15.63 kHz
128 8:  10.42 kHz
129 9:  7.81 kHz**
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132 (% style="color:red" %)**Default Value: AT+BW=0,0**  (%%) ~/~/  BandWidth: 125kHz ,125kHz
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134 (% style="color:red" %)**Range: (0 ~~ 9)**
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