SUNGTAE KIM / Mbed OS mbed-os-example-cellular-BG96-TCP

Set specific IP Address/Port

Overview

This code could be access via Cat.M1(BG96 module) of SK telecom network in Korea. Need a WIZnet IoT Shield BG96 board and development board. The code forked Daniel_Lee's mbed-os-example-cellular-BG96 repository(https://os.mbed.com/users/Daniel_Lee/code/mbed-os-example-cellular-BG96/) and added some features.

This example is known to work great on the following platforms:

/media/uploads/stkim92/pel01.png

Requirement

  1. FRDM-K64F or FRDM-K66F
  2. WIZnet IoT Shield BG96 board
  3. USIM card

Example functionality

This example showcases the following device functionality:

1. Import into Compiler

/media/uploads/stkim92/cellular_1.png

2. Compile and Program

/media/uploads/stkim92/cellular_2.png

3. If successfully connect to cellular networks(SKTelecom) then you can get below message

Device's Result

include the mbed library with this snippet

mbed-os-example-cellular


Built: Sep  6 2019, 07:06:26


[MAIN], plmn: NULL
Establishing connection
M2Mnet(BG96) Power ON
[00005500ms][INFO][CELL]: New CellularContext  (20004120)
[00005500ms][INFO][CELL]: CellularContext plmn NULL
[00005501ms][INFO][CELL]: CellularContext connect
[00006502ms][INFO][CELL]: Start connecting (timeout 1000 ms)
[00006511ms][INFO][CELL]: RSSI unknown
[00006519ms][INFO][CELL]: Modem ready
[00006523ms][INFO][CELL]: RSSI unknown
[00006523ms][INFO][CELL]: Setup SIM (timeout 1000 ms)
[00006528ms][INFO][CELL]: SIM is ready
[00006555ms][INFO][CELL]: RSSI unknown
[00006563ms][INFO][CELL]: Network registration (timeout 1000 ms)
[00006567ms][INFO][CELL]: Continue after 1 seconds
[00006688ms][ERR ][CELL]: AT overflow
[00007572ms][INFO][CELL]: RSSI unknown
[00007578ms][INFO][CELL]: Registering network => Attaching network
[00007582ms][INFO][CELL]: RSSI unknown
[00007582ms][INFO][CELL]: Attaching network (timeout 1000 ms)
[00007606ms][INFO][CELL]: Found PDP context 2
[00007609ms][INFO][CELL]: Activate PDP context 2
[00009626ms][INFO][CELL]: Found PDP context 2


Connection Established.
[00009635ms][INFO][CELL]: Socket 0 open
[00009741ms][INFO][CELL]: Socket 0 sent 4 bytes to 222.98.173.203 port 7878
TCP: Sent 4 Bytes to 222.98.173.203
[00010873ms][INFO][CELL]: Socket 0 recv 4 bytes
[00011421ms][INFO][CELL]: Socket 0 closed
Received from server 4 Bytes
[00011421ms][INFO][CELL]: CellularContext disconnect()
[00011422ms][INFO][CELL]: cb: CellularContext disconnected


Success. Exiting

Server Result

/media/uploads/stkim92/mbed_guide_bg96_cellular-3.png

Files at this revision

API Documentation at this revision

Revision 45:2d57fafd8d73, committed 2019-09-06

Comitter:
stkim92
Date:
Fri Sep 06 07:44:03 2019 +0000
Parent:
44:e621506d052d
Commit message:
Set Server IP/Port

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/main.cpp	Wed Jul 24 15:27:53 2019 +0000
+++ b/main.cpp	Fri Sep 06 07:44:03 2019 +0000
@@ -45,10 +45,13 @@
 NetworkInterface *iface;
 
 // Echo server hostname
-const char *host_name = MBED_CONF_APP_ECHO_SERVER_HOSTNAME;
+//nst char *host_name = MBED_CONF_APP_ECHO_SERVER_HOSTNAME;
+const char *server_ip_address = "222.98.xxx.xxx";
 
 // Echo server port (same for TCP and UDP)
-const int port = MBED_CONF_APP_ECHO_SERVER_PORT;
+//const int port = MBED_CONF_APP_ECHO_SERVER_PORT;
+const int port = 7878;
+
 
 static rtos::Mutex trace_mutex;
 
@@ -169,17 +172,18 @@
     }
 
     SocketAddress sock_addr;
-    retcode = iface->gethostbyname(host_name, &sock_addr);
-    if (retcode != NSAPI_ERROR_OK) {
-        print_function("Couldn't resolve remote host: %s, code: %d\n", host_name, retcode);
-        return -1;
-    }
-
+    //retcode = iface->gethostbyname(host_name, &sock_addr);
+    //if (retcode != NSAPI_ERROR_OK) {
+    //    print_function("Couldn't resolve remote host: %s, code: %d\n", host_name, retcode);
+    //   return -1;
+    //}
+    
+    sock_addr.set_ip_address(server_ip_address);
     sock_addr.set_port(port);
 
     sock.set_timeout(15000);
     int n = 0;
-    const char *echo_string = "TEST";
+    const char *msg_string = "TEST";
     char recv_buf[4];
 #if MBED_CONF_APP_SOCK_TYPE == TCP
     retcode = sock.connect(sock_addr);
@@ -187,20 +191,22 @@
         print_function("TCPSocket.connect() fails, code: %d\n", retcode);
         return -1;
     } else {
-        print_function("TCP: connected with %s server\n", host_name);
+        //int_function("TCP: connected with %s server\n", host_name);
+        //int_function("TCP: connected with %s server\n", sock_addr.get_ip_address());
     }
-    retcode = sock.send((void*) echo_string, sizeof(echo_string));
+    retcode = sock.send((void*) msg_string, sizeof(msg_string));
     if (retcode < 0) {
         print_function("TCPSocket.send() fails, code: %d\n", retcode);
         return -1;
     } else {
-        print_function("TCP: Sent %d Bytes to %s\n", retcode, host_name);
+        //print_function("TCP: Sent %d Bytes to %s\n", retcode, host_name);
+        print_function("TCP: Sent %d Bytes to %s\n", retcode, sock_addr.get_ip_address());
     }
 
     n = sock.recv((void*) recv_buf, sizeof(recv_buf));
 #else
 
-    retcode = sock.sendto(sock_addr, (void*) echo_string, sizeof(echo_string));
+    retcode = sock.sendto(sock_addr, (void*) msg_string, sizeof(msg_string));
     if (retcode < 0) {
         print_function("UDPSocket.sendto() fails, code: %d\n", retcode);
         return -1;
@@ -214,7 +220,7 @@
     sock.close();
 
     if (n > 0) {
-        print_function("Received from echo server %d Bytes\n", n);
+        print_function("Received from server %d Bytes\n", n);
         return 0;
     }