1. /**
2.  * @file main.cpp
3.  * @brief rhomb.io SIM868 demo
4.  * @author rhomb.io Software Team
5.  *
6.  * Version 1.0
7.  *
8.  * @copyright Copyright (c) 2019
9.  */
10.  
11. #include <Arduino.h>
12.  
13. // Include rhio-pinmap and enable one MCU
14. // #define S100_DUINO_UNO_v1_0
15. // #define S100_DUINO_LEONARDO_v1_0
16. // #define S200_DUINO_UNO_PRO_v1_0
17. #define S200_DUINO_ZERO_v1_0
18. // #define S100_DUINO_MEGA_v2_0
19. // #define S100_ESP32_WROOM_32_v1_0
20. // #define S100_ESP_WROOM_02_v1_0
21. #include "rhio-pinmap.h"
22.  
23. // SIM868 pins on Socket 1
24. #define GSM_PWREN  IO0
25. #define GSM_PWRKEY IO1
26. #define GPS_EN     IO2
27. #define GSM_STATUS IO3
28.  
29. // SIM868 pins on Socket 2 (only Duino Mega)
30. // #define GSM_PWREN  IO8
31. // #define GSM_PWRKEY IO9
32. // #define GPS_EN     IO10
33. // #define GSM_STATUS IO11
34.  
35. // SIM868 apn parameters
36. #define RH_apn "m2m.orange.es"
37. #define RH_apnUser ""
38. #define RH_apnPass ""
39. #define RH_remoteServer "45.76.37.219"
40. #define RH_remotePort "3136"
41.  
42. // Monitor serial (debug) and modem At commands
43. #ifdef S200_DUINO_ZERO_v1_0
44.   #define SerialMon SerialUSB
45.   #define SerialAt Serial1 // Serial1 = UART-A
46. #endif
47.  
48. #ifdef S100_DUINO_UNO_v1_0
49.   #include SoftwareSerial
50.   SoftwareSerial SoftSerial(IO6, IO7); // also may be SDA,SCL, MISO,MOSI and others
51.   #define SerialMon SoftSerial
52.   #define SerialAt Serial // Serial1 = UART-A
53. #endif
54.  
55. #ifdef S100_DUINO_MEGA_v2_0
56.   #define SerialMon Serial1 // UART-B
57.   #define SerialAt Serial // UART-A
58. #endif
59.  
60. // At commands responses will be allocated here
61. u_int8_t signal_quality;
62. char buffer[30];
63.  
64. void configureIos () {
65.   pinMode(GSM_PWRKEY, OUTPUT);
66.   pinMode(GSM_PWREN, OUTPUT);
67.   pinMode(GPS_EN, OUTPUT);
68.   pinMode(GSM_STATUS, INPUT);
69. }
70.  
71. void configureSerial () {
72.   SerialMon.begin(9600);
73.   while (!SerialMon) {}
74.  
75.   SerialAt.begin(9600);
76.   while (!SerialAt) {}
77. }
78.  
79. /**
80.  * @brief Turn on the modem
81.  *
82.  * To be able to use the SIM868 module we have to activate the PWREN line and
83.  * make a pulse of 1.5 seconds in the PWRKEY line. The modem will have been
84.  * turned on when the STATUS line goes to high level.
85.  *
86.  * This allows the MCU to control the power of the device, necessary for low
87.  * power applications. By default the modem will be turned off and will only
88.  * turn on if we perform the turn on routine as seen in this method.
89.  *
90.  * @return true if the modem has been turned on
91.  * @return false
92.  */
93. bool powerOn () {
94.   uint8_t gsm_status;
95.  
96.   digitalWrite(GSM_PWREN, HIGH);
97.  
98.   for (char i=0; i<5; i++) {
99.     gsm_status = digitalRead(GSM_STATUS);
100.     if (gsm_status == HIGH){
101.       SerialMon.println(F("GSM HIGH!!"));
102.       break;
103.     } else {
104.       SerialMon.println(F("GSM LOW!"));
105.       digitalWrite(GSM_PWRKEY, HIGH);
106.       delay(1500);
107.       digitalWrite(GSM_PWRKEY, LOW);
108.       delay(1500);
109.     }
110.   }
111.  
112.   if (!gsm_status) {
113.     return false;
114.   }
115.  
116.   // Turn on the GPS. It is not necessary for modem operation but this demo
117.   // will make use of GPS.
118.   digitalWrite(GPS_EN, HIGH);
119.   SerialAt.println("AT+CGNSPWR=1");
120.   delay(3000);
121.  
122.   // We obviate the result of enabling GPS
123.   return true;
124. }
125.  
126. void sendAt(const char * command){
127.  
128.   strcpy(buffer,"");
129.   SerialAt.println(command);
130.   uint32_t init=millis();
131.  
132.   int count=0;
133.     while (SerialAt.available() || (millis() - init) < 3000)
134.     {
135.       buffer[count] = SerialAt.read();
136.       count++;
137.       delay(10);
138.     }
139.  
140.       buffer[count]='\n';
141.  
142.   SerialMon.print("La respuesta es: ");
143.   SerialMon.println(buffer);
144.  
145. }
146.  
147. void setup () {
148.   configureIos();
149.   configureSerial();
150.  
151.   if (!powerOn()) {
152.     SerialMon.println("Fail to power on the modem. Is the SIM868 connected to the Socket 1?");
153.     for (;;) {}
154.   }
155.  
156.   sendAt("AT"); // test modem, should return "OK"
157.   if(strcmp(buffer,"OK")){
158.     sendAt("AT+SHUT");   //sets down any previous gprs conexions, should return "SHUT OK"
159.     sendAt("AT+CIPMUX=0");   //sets single conexion mode, should return "OK"
160.     sendAt("AT+CGATT=1");    //attaches GPRS Service, should return "OK"
161.     sendAt("AT+CSTT=RH_apn,RH_apnUser,RH_apnPass");
162.     sendAt("AT+CIICR"); //brings up the GPRS connexions, sometimes it takes a bit to respond, but should return "OK"
163.     sendAt("AT+CIFSR");   //gives us our IP Address
164.     sendAt("AT+CIPSTART=TCP,RH_remoteServer,RH_remotePort");
165.   }
166.  
167. }
168.  
169. bool checkCreg () {
170.   for (auto i = 0; i < 20; i++) {
171.     sendAt("AT+CREG?");
172.     if (strstr(buffer, ",1")) {
173.       // tenemos CREG!!!
174.       return true;
175.     }
176.     delay(1000);
177.   }
178.  
179.   return false;
180. }
181.  
182. void loop () {
183.   // Get GPS. It will be necessary a few minutes before obtaining data.
184.   // The important thing for this demo is not to get GPS data, but to check
185.   // that we can send a command to the modem and get a response.
186.   // SerialAt.println("AT+CGNSINF");   (Read GPS location data)    
187.   // delay(1000);
188.  
189.   sendAt("AT");
190.   if (strcmp(buffer, "OK")) {
191.     SerialMon.println("El modem funciona!!");
192.   } else {
193.     Serial.println("Huston tenemos un problema");
194.   }
195.  
196.   if (checkCreg()) {
197.     SerialMon.println("Tenemos conexión a red!!");
198.   }
199.  
200.   //sendAt("AT+CSQ");
201.  
202.  
203.  
204.   // wait for loop
205.   delay(5000);
206. }
207.  
208. //AT+CSQ (Comando AT que indica la calidad de la señal o la cobertura)
209.