-
Notifications
You must be signed in to change notification settings - Fork 239
/
HC-12-LocalChat.ino
169 lines (149 loc) · 5.87 KB
/
HC-12-LocalChat.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
/* LocalChat is a chat application example using the Arduino IDE serial
monitor implemented in 170 lines of code. PJON in local mode is used to
support up to 254 participants, the Arduino IDE serial monitor is used as
the user interface. Using HC-12 (HCMODU0054) wireless serial module a
decentralized wireless network of computers can be made with USB enabled
Arduino compatible devices used as USB to HC-12 radio 433MHz gateways.
User's 1 laptop User's 2 laptop
__________________ __________________
||1:Ciao 2! || ||1:Ciao 2! ||
||2:Ciao 1 :) || ||2:Ciao 1 :) ||
||1:Awesome chat! || LOS or line of sight range ||1:Awesome chat! ||
||________________|| 150-1800m ||________________||
|__________________| USB _______ _______ USB |__________________|
|[][][][][][][][][]|=====|ARDUINO| |ARDUINO|=====|[][][][][][][][][]|
|[][][][][][][][][]| | HC-12 | | HC-12 | |[][][][][][][][][]|
|[][][]|____|[][][]| |_______| |_______| |[][][]|____|[][][]|
|__________________| |__________________|
Open the Arduino IDE serial monitor at 115200 baud to initiate the chat
Giovanni Blu Mitolo 2018 */
/* Set synchronous response timeout to 200 milliseconds.
If operating at less than 9600Bd TS_RESPONSE_TIME_OUT should be longer */
#define TS_RESPONSE_TIME_OUT 200000
/* Include the packet id feature to support packet duplication avoidance i.e.
avoid cases where a missed acknowledgement because of range or interference
can lead to message duplications:
user 1: Ciao!
user 1: Ciao!
user 1: Ciao! */
#define PJON_INCLUDE_PACKET_ID
/* Use 63 characters maximum packet length.
HC-12 has two 64-byte Rx and Tx FIFO memories built into the chip,
supporting up to 64 bytes maximum packet length */
#define PJON_PACKET_MAX_LENGTH 63
#include <PJONThroughSerial.h>
#include <SoftwareSerial.h>
SoftwareSerial HC12(2, 3);
PJONThroughSerial bus;
uint8_t packet[100];
String string_number;
int req_index = 0;
bool parse_id = true;
bool initialized = false;
uint8_t recipient = 0;
void receiver_function(uint8_t *payload, uint16_t length, const PJON_Packet_Info &packet_info) {
// Received messages sender id and content are printed here
if(packet_info.tx.id == recipient || packet_info.tx.id == PJON_BROADCAST) {
Serial.print("user ");
Serial.print(packet_info.tx.id);
Serial.print((packet_info.rx.id == PJON_BROADCAST) ? " " : ": ");
for(uint16_t i = 0; i < length; i++)
Serial.print((char)payload[i]);
Serial.println();
}
};
void error_handler(uint8_t code, uint8_t data) {
if(code == PJON_CONNECTION_LOST) {
Serial.print("Message delivery fail to user id: ");
Serial.println((uint8_t)bus.packets[data].content[0]);
}
if(code == PJON_CONTENT_TOO_LONG) {
Serial.print("Message too long, length: ");
Serial.print(data);
Serial.print(", maximum length: ");
Serial.println(PJON_PACKET_MAX_LENGTH);
}
};
void setup() {
// Initialize LED 13 to be off
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, LOW);
// Set HC12 baudrate (you must use the one configured in HC12, default 9600)
HC12.begin(9600);
// Pass the HC12 Serial instance you want to use for PJON communication
bus.strategy.set_serial(&HC12);
// Avoid messages duplication
bus.set_packet_id(true);
bus.set_receiver(receiver_function);
bus.set_error(error_handler);
bus.begin();
Serial.begin(115200);
Serial.println("LocalChat - Giovanni Blu Mitolo 2018");
Serial.println("User id configuration guide:");
Serial.println("1) Set serial monitor 'Newline' ending");
Serial.println("2) Enter your user id (1-254) in the text field");
Serial.println("3) Press 'Send'");
Serial.println();
};
void error_handler(uint8_t code, uint16_t data, void *custom_pointer) {
if(code == PJON_CONNECTION_LOST) {
Serial.print("Connection with device ID ");
Serial.print(bus.packets[data].content[0], DEC);
Serial.println(" is lost.");
}
if(code == PJON_PACKETS_BUFFER_FULL) {
Serial.print("Packet buffer is full, has now a length of ");
Serial.println(data, DEC);
Serial.println("Possible wrong bus configuration!");
Serial.println("higher PJON_MAX_PACKETS if necessary.");
}
if(code == PJON_CONTENT_TOO_LONG) {
Serial.print("Content is too long, length: ");
Serial.println(data);
}
};
void loop() {
// Handle PJON connectivity if no data has been sent from serial monitor
if(Serial.available() <= 0) {
bus.receive(200000);
bus.update();
} else { // Handle data from serial monitor
char req_byte = Serial.read();
string_number += req_byte;
if(initialized && recipient) {
if(!req_index) {
Serial.print("user ");
Serial.print((uint8_t)bus.device_id(), DEC);
Serial.print(": ");
}
Serial.print(req_byte);
packet[req_index] = req_byte;
}
if(req_byte == '\n') {
if(initialized) {
if(!recipient) {
recipient = (uint8_t)string_number.toInt();
Serial.print("Recipient's user id ");
Serial.print(recipient, DEC);
Serial.println(" set.");
Serial.println();
Serial.println("LocalChat is now online!");
uint8_t hello[10] = "is online.";
bus.send(0, hello, 10);
} else bus.send(recipient, packet, req_index);
} else {
bus.set_id((uint8_t)string_number.toInt());
Serial.print("User id ");
Serial.print(bus.device_id(), DEC);
Serial.println(" set.");
Serial.println("Enter the recipient's user id (1-254) and press 'Send'");
initialized = true;
}
parse_id = true;
req_index = 0;
string_number = "";
return;
}
req_index++;
}
};