-
Notifications
You must be signed in to change notification settings - Fork 10
/
RFM95_Receive.ino
284 lines (211 loc) · 7.9 KB
/
RFM95_Receive.ino
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
/*
Author: Eric Tsai, 2018
License: CC-BY-SA, https://creativecommons.org/licenses/by-sa/2.0/
File: RFM95_Receive.ino
Purpose: LoRa to Serial gateway, converts LoRa packet to serial in JSON format
Credit: Original LoRa code from Adafruit LoRa example.
*/
#include <SPI.h>
#include <RH_RF95.h>
#include <ArduinoJson.h> //change: use version 5.10 for higher precision float support
//pin out Arduino uno
/*
RFM95:DIO0 (int, yellow) --> Uno:pin2
RFM95:reset (rst, yellow) --> Uno:pin9
RFM95:nss (select, white) --> Uno:pin10
RFM95:sck (clock, blue) --> Uno:pin13
RFM95:mosi (mosi, green) --> Uno:pin11
RFM95:DIO0 (miso, white) --> Uno:pin12
*/
//Using 32U4 Adafruit-or clone version of RFM95 module, these are SPI pins.
#define RFM95_CS 8
#define RFM95_RST 4
#define RFM95_INT 7
//For Arduino Uno or Nano, this is interface for SPI
//#define RFM95_CS 10
//#define RFM95_RST 9
//#define RFM95_INT 2
//Pin# 10, 11, 12, 13 = CS, MOSI, MISO, NSS
//Pin #9 - reset
//Pin #2 - DIO-0 interrupt
uint8_t GATEWAY_ID = 1;
//const int pinHandShake = 4; //handshake, serial-to-mqtt flow control for Uno/Nano
const int pinHandShake = 6; //handshake, serial-to-mqtt flow control for 32U4
// Change to 434.0 or other frequency, must match RX's freq!
#define RF95_FREQ 915.0
// Singleton instance of the radio driver
RH_RF95 rf95(RFM95_CS, RFM95_INT);
// Blinky on receipt
#define LED 13
//using softwareserial for uart to BLE module
#include <SoftwareSerial.h>
//SoftwareSerial BLE_Serial(5, 6); // RX(yellow), TX(blue)
void setup()
{
//delay(10000);
pinMode(pinHandShake, INPUT_PULLUP); //make sure ETH gateway GND's pin.
pinMode(RFM95_RST, OUTPUT);
digitalWrite(RFM95_RST, HIGH);
while (!Serial);
Serial.begin(9600);
delay(100);
//Serial.println("after 10 seconds, ready");
// manual reset
digitalWrite(RFM95_RST, LOW);
delay(10);
digitalWrite(RFM95_RST, HIGH);
delay(10);
while (!rf95.init()) {
Serial.println("LoRa radio init failed");
while (1);
}
Serial.println("LoRa radio init OK!");
// Defaults after init are 434.0MHz, modulation GFSK_Rb250Fd250, +13dbM
if (!rf95.setFrequency(RF95_FREQ)) {
Serial.println("setFrequency failed");
while (1);
}
Serial.print("Set Freq to: "); Serial.println(RF95_FREQ);
// Defaults after init are 434.0MHz, 13dBm, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on
//change modulation scheme here; faster than 125kHz BW is unstable
//Bw125Cr45Sf128, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on. Default medium range.
//Bw500Cr45Sf128, Bw = 500 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on. Fast+short range.
//Bw31_25Cr48Sf512, Bw = 31.25 kHz, Cr = 4/8, Sf = 512chips/symbol, CRC on. Slow+long range.
//Bw125Cr48Sf4096, Bw = 125 kHz, Cr = 4/8, Sf = 4096chips/symbol, CRC on. Slow+long range.
/*
if (!rf95.setModemConfig(RH_RF95::Bw31_25Cr48Sf512)) {
Serial.println("setModemConfig failed");
while (1);
}
Serial.println("Set setModemConfig to: something");
*/
// The default transmitter power is 13dBm, using PA_BOOST.
// If you are using RFM95/96/97/98 modules which uses the PA_BOOST transmitter pin, then
// you can set transmitter powers from 5 to 23 dBm:
rf95.setTxPower(23, false);
//BLE serial port
//BLE_Serial.begin(9600);
}
void loop()
{
if (rf95.available())
{
// Should be a message for us now
uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
//char buf[RH_RF95_MAX_MESSAGE_LEN];
uint8_t len = sizeof(buf);
if (rf95.recv(buf, &len))
{
//digitalWrite(LED, HIGH);
RH_RF95::printBuffer("Received: ", buf, len);
/*
Radio packet to send:
MAC[6 bytes], volt [4 bytes], xmit count [1 byte], rssi[1 byte], gateway #[1 byte], sensor json
[0-5] [6-9] [10] [11] [12] [13-x]
MAC[6 bytes], volt [4 bytes], xmit count [1 byte], rssi[1 byte], gateway #[1 byte], sensor json
[1-6] [7-10] [11] [12] [13] [14-x]
For a LoRa sensor:
rssi=0
gateway=0
LoRa Repeater will have gateway != 0
uart ble:
{"mac":c56e806d7cfb,"rssi":-44,"volt":3.00,"tmr":132,"xmit_cnt":240,"mag/p":0}
uart lora:
{"mac":c56e806d7cfb,"volt":3.00,"xmit_cnt":240,"rssi":-44,"gw":1,"mySensorValue":xxx, "mySensorValue":yyy}
MQTT:
/xxx/Gateway/MAC/metric ____ value
*/
if (len >= 9)
{
//capture RRSI and gateway for zeros to see if repeated packet or not
uint8_t gateway = buf[13];
int8_t rssi = buf[12];
//Dont' use Serial.print(x, HEX), because it's capital, and misses single diggit hex<0x10.
Serial.print("{\"mac\":");
//six hex bytes to 12 ascii;
for(int i=1; i<7; i++)
{
char upper;
char lower;
upper = buf[i] >> 4 & 0x0f;
lower = buf[i] & 0x0f;
char upper2 = upper + 48;
char lower2 = lower + 48;
if (upper > 9)
upper2 += 39;
if (lower > 9)
lower2 +=39;
Serial.print(upper2);
Serial.print(lower2);
}
//volt
Serial.print(",\"volt\":");
// {"mac":c56e806d7cfb,"volt":
Serial.print((char)buf[7]);
Serial.print((char)buf[8]);
Serial.print((char)buf[9]);
Serial.print((char)buf[10]);
// {"mac":c56e806d7cfb,"volt":3.00
//xmit_cnt
Serial.print(",\"xcnt\":");
// {"mac":c56e806d7cfb,"volt":3.00,"xmit_cnt":
Serial.print(buf[11], DEC);
// {"mac":c56e806d7cfb,"volt":3.00,"xmit_cnt":240,
//rssi (if repeat or direct)
Serial.print(",\"rssi\":");
// {"mac":c56e806d7cfb,"volt":3.00,"xmit_cnt":240,"rssi":
//if gateway>0, that means it's a repeat, so just replicate gateway
if (gateway > 0)
{
Serial.print(rssi);
}
else
//gateway=0, it's sensor data, so RSSI is valid
{
Serial.print(rf95.lastRssi(), DEC);
}
// {"mac":c56e806d7cfb,"volt":3.00,"xmit_cnt":240,"rssi":-44
//gateway (if repeat or direct)
Serial.print(",\"gw\":");
// {"mac":c56e806d7cfb,"volt":3.00,"xmit_cnt":240,"rssi":-44,"gw":
//gateway name:
//for ESP8266, if "gw" exists, use "gw" value.
if (gateway > 0)
{
Serial.print(gateway);
}
else
//gateway=0, it's sensor data, so RSSI is valid
{
Serial.print(GATEWAY_ID);
}
// {"mac":c56e806d7cfb,"volt":3.00,"xmit_cnt":240,"rssi":-44,"gw":1
//{"mac":c56e806d7cfb,"volt":3.00,"xmit_cnt":240,"rssi":-44,"gw":1,"mySensorValue":xxx, "mySensorValue":yyy}
Serial.print(",");
//json looks like this:
// "lo":xxxx,"la":xxxx
//json
for (int i=14; i<len-1; i++)
{
Serial.print(char(buf[i]));
}
Serial.print("}");
Serial.print("\r\n");
} //if buf len is big enough
}
else
{
Serial.println("Receive failed");
}
while (digitalRead(pinHandShake) == 0)
{
//loop until MQTT bridge ready to receive to avoid correupted JSON...optional
//acts like uart flow control. If pin is disconnected, works as normal, might get multiple uart lines
//expect serial-MQTT bridge to ground the pin when receiving uart and posting MQTT.
}
}//received RFM
//BLE send
if (Serial.available()) {
//BLE_Serial.write(Serial.read());
}
}