Wiki source code of Point to Point Communication of LT-22222-L
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| author | version | line-number | content |
|---|---|---|---|
| 1 | {{box cssClass="floatinginfobox" title="**Contents**"}} | ||
| 2 | {{toc/}} | ||
| 3 | {{/box}} | ||
| 4 | |||
| 5 | = **1. Overview** = | ||
| 6 | |||
| 7 | ((( | ||
| 8 | Shipped LT-22222-L is base on LoRaWAN protocol. We also develop a open source Point to Point LoRa protocol for LT-22222-L. The source code and hex file can be found at: | ||
| 9 | ))) | ||
| 10 | |||
| 11 | ((( | ||
| 12 | [[Point to Point Software for LT-22222-L>>https://github.com/dragino/LT-22222-L]]. | ||
| 13 | ))) | ||
| 14 | |||
| 15 | == == | ||
| 16 | |||
| 17 | = **2. Features for this firmware** = | ||
| 18 | |||
| 19 | |||
| 20 | == **2.1 Point To Point** == | ||
| 21 | |||
| 22 | |||
| 23 | [[image:image-20220602111219-1.png||height="472" width="972"]] | ||
| 24 | |||
| 25 | |||
| 26 | (% class="wikigeneratedid" id="H2.2.Configure" %) | ||
| 27 | (% style="color:blue" %)**Configure:** | ||
| 28 | |||
| 29 | |||
| 30 | (% border="1" style="background-color:#f7faff; color:black; width:500px" %) | ||
| 31 | |=**A's configuration**|=**B's configuration** | ||
| 32 | |AT+GROUPMOD=0|AT+GROUPMOD=0 | ||
| 33 | |AT+TXCHS=868700000|AT+TXCHS=869000000 | ||
| 34 | |AT+RXCHS=869000000|AT+RXCHS=868700000 | ||
| 35 | |AT+TRIG1=2,50|AT+TRIG1=2,50 | ||
| 36 | |AT+TRIG2=2,50|AT+TRIG2=2,50 | ||
| 37 | |AT+DI1TODO1=2|AT+DI1TODO1=2 | ||
| 38 | |AT+DI1TORO1=2|AT+DI1TORO1=2 | ||
| 39 | |AT+DI2TODO2=2 |AT+DI2TODO2=2 | ||
| 40 | |AT+DI2TORO2=2|AT+DI2TORO2=2 | ||
| 41 | |||
| 42 | == **2.2 Point To Mult-Point ** == | ||
| 43 | |||
| 44 | |||
| 45 | [[image:image-20220602111219-2.png]] | ||
| 46 | |||
| 47 | |||
| 48 | [[image:image-20220602111219-3.png]] | ||
| 49 | |||
| 50 | If the sender does not get the ACK reply from the receiver, it will retransmit up to 4 times, each interval is 6 seconds, and the UplinkCounter of the retransmission will not increase. | ||
| 51 | |||
| 52 | |||
| 53 | == **2.3 AT command** == | ||
| 54 | |||
| 55 | |||
| 56 | ATZ : Trig a reset of the MCU | ||
| 57 | |||
| 58 | AT+FDR : Reset Parameters to Factory Default, Keys Reserve | ||
| 59 | |||
| 60 | AT+FCU : Get or Set the Frame Counter Uplink | ||
| 61 | |||
| 62 | AT+FCD : Get or Set the Frame Counter Downlink | ||
| 63 | |||
| 64 | AT+TXP : Get or Set the transmit power, the maximum is 20dBm (default is 14dBm) | ||
| 65 | |||
| 66 | AT+SYNC : Get or Set the Sync word [1:0x34,0:0x12] (default is 1) | ||
| 67 | |||
| 68 | AT+PMB : Get or Set the preamble (default:8) | ||
| 69 | |||
| 70 | AT+TXCHS : Get or Set the transmit frequency of TX (default:868700000) | ||
| 71 | |||
| 72 | AT+TXSF : Get or Set the spreading factor of TX (7 to 12) (default:12) | ||
| 73 | |||
| 74 | AT+RXCHS : Get or Set the transmit frequency of RX (default:869000000) | ||
| 75 | |||
| 76 | AT+RXSF : Get or Set the spreading factor of RX (7 to 12) (default:12) | ||
| 77 | |||
| 78 | AT+BW : Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0) | ||
| 79 | |||
| 80 | AT+CR : Get or Set the coding rate [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8] (default:1) | ||
| 81 | |||
| 82 | AT+TDC : Get or set the application data transmission interval in ms(default 10 minutes) | ||
| 83 | |||
| 84 | AT+VER : Get firmware version number | ||
| 85 | |||
| 86 | AT+SEND : Set Custom sent hex data | ||
| 87 | |||
| 88 | AT+GROUPMOD : Set or Get the grouping mode of the device (default: 0) | ||
| 89 | |||
| 90 | AT+GROUPID : Set or Get the password for matching between TX group and RX group, which can be composed of numbers or characters (default: 12345678) | ||
| 91 | |||
| 92 | AT+TRIG1 : Set or Get the DI1 pin interrupt trigger mode (default 0,0) | ||
| 93 | |||
| 94 | AT+TRIG2 : Set or Get the DI2 pin interrupt trigger mode (default 0,0) | ||
| 95 | |||
| 96 | AT+DI1TODO1 : Set or get the mode in which DI1 maps to DO1 (default 0) | ||
| 97 | |||
| 98 | AT+DI1TORO1 : Set or get the mode in which DI1 maps to RO1(default 0) | ||
| 99 | |||
| 100 | AT+DI2TODO2 : Set or get the mode in which DI2 maps to DO2(default 0) | ||
| 101 | |||
| 102 | AT+DI2TORO2 : Set or get the mode in which DI2 maps to RO2(default 0) | ||
| 103 | |||
| 104 | |||
| 105 | |||
| 106 | **Example1:** AT+SEND=01020304 will send a payload of 01020304 | ||
| 107 | |||
| 108 | |||
| 109 | i.g. AT+TRIGx=a Trigger directly without triggering time | ||
| 110 | |||
| 111 | AT+TRIGx=a,b a=0, falling edge; | ||
| 112 | |||
| 113 | a=1, rising edge; | ||
| 114 | |||
| 115 | a=2, falling edge or rising edge. | ||
| 116 | |||
| 117 | b, triggering time in milliseconds | ||
| 118 | |||
| 119 | AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms | ||
| 120 | |||
| 121 | |||
| 122 | i.g. AT+DI1TODO1= maps value | ||
| 123 | |||
| 124 | AT+DI1TORO1= maps value | ||
| 125 | |||
| 126 | AT+DI2TODO2= maps value | ||
| 127 | |||
| 128 | AT+DI2TORO2= maps value | ||
| 129 | |||
| 130 | |||
| 131 | |||
| 132 | |||
| 133 | (% border="1" style="background-color:#f7faff; color:black; width:706px" %) | ||
| 134 | |=(% style="width: 102px;" %)Maps value|=(% style="width: 331px;" %)DIx to DOx|=(% style="width: 268px;" %)DIx to ROx | ||
| 135 | |(% style="width:102px" %)0|(% style="width:331px" %)No Action|(% style="width:268px" %)No Action | ||
| 136 | |(% style="width:102px" %)1|(% style="width:331px" %)If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level|(% style="width:268px" %)((( | ||
| 137 | If DIx is high, control ROx to close, | ||
| 138 | |||
| 139 | if DIx is low, control ROx to open | ||
| 140 | ))) | ||
| 141 | |(% style="width:102px" %)2|(% style="width:331px" %)If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level|(% style="width:268px" %)((( | ||
| 142 | If DIx is high, control ROx to open, | ||
| 143 | |||
| 144 | if DIx is low, control ROx to close | ||
| 145 | ))) | ||
| 146 | |(% style="width:102px" %)3|(% style="width:331px" %)DOx state flip|(% style="width:268px" %)ROx state flip | ||
| 147 | |||
| 148 | i.g. AT+GROUPMOD=0 Set to point to point mode | ||
| 149 | |||
| 150 | AT+GROUPMOD=0,aa Set the TX group that controls the number of aa (The maximum value of aa is 8) | ||
| 151 | |||
| 152 | AT+GROUPMOD=1,bb Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8) | ||
| 153 | |||
| 154 | |||
| 155 | AT+GROUPMOD=0,2 Set to control the TX group of the two RX groups | ||
| 156 | |||
| 157 | AT+GROUPMOD=1,1 Set the RX group numbered 1 | ||
| 158 | |||
| 159 | AT+GROUPMOD=1,2 Set the RX group numbered 2 | ||
| 160 | |||
| 161 | |||
| 162 | |||
| 163 | == **2.4 Data Format** == | ||
| 164 | |||
| 165 | 8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum | ||
| 166 | |||
| 167 | |||
| 168 | Payload: | ||
| 169 | |||
| 170 | (% border="1" style="background-color:#f7faff; color:black; width:938px" %) | ||
| 171 | |=(% style="width: 123px;" %)**Size (bytes)**|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1 | ||
| 172 | |(% style="width:123px" %)**Value**|(% style="width:38px" %)address|(% style="width:70px" %)request|(% style="width:52px" %)ACK|(% style="width:127px" %)((( | ||
| 173 | DI1& | ||
| 174 | |||
| 175 | DI1 level | ||
| 176 | )))|(% style="width:101px" %)DI1TODO1|(% style="width:91px" %)DI1TORO1|(% style="width:111px" %)((( | ||
| 177 | DI2& | ||
| 178 | |||
| 179 | DI2 level | ||
| 180 | )))|(% style="width:105px" %)DI2TODO2|(% style="width:106px" %)DI2TORO2 | ||
| 181 | |||
| 182 | **The first byte**: 00 is the broadcast address, 01-08 is the RX group number | ||
| 183 | |||
| 184 | **The second byte**: send mapping request when not 0, not request when it is 0 | ||
| 185 | |||
| 186 | **The third byte**: ACK returned to the sender after the mapping is completed | ||
| 187 | |||
| 188 | **The fourth byte**: the high four bits are 1 to represent DI1, and the low four bits are the level of DI1 when the interrupt is triggered | ||
| 189 | |||
| 190 | **The Fifth byte**: DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered | ||
| 191 | |||
| 192 | **The Sixth byte**: 0 does not trigger interrupt when DI1TORO1 interrupt is triggered | ||
| 193 | |||
| 194 | **The seventh byte**: the high four bits are 2 to represent DI2, and the low four bits are the level of DI2 when the interrupt is triggered | ||
| 195 | |||
| 196 | **The 8th byte**: DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered | ||
| 197 | |||
| 198 | **The 9th byte**: DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered | ||
| 199 | |||
| 200 |