Daniel Lee / Mbed OS mbed-os-example-cellular_BG96_os511

This is an example based on mbed-os cellular APIs that demonstrates a TCP or UDP echo transaction with a public echo server. Especially, BG96 operation check based Mbed OS 5.11, tested via SK Telecom in Korea

This code could be access via Cat.M1(BG96 module) of SK telecom network in Korea. Need a WIZnet BG96 board and development board. Before using this code, must be checking your modem is authorized or not from SK telecom. This code is based on Mbed OS 5.11.5.

/media/uploads/Daniel_Lee/img_8560.jpg

Tested with

  • DISCOVERY_L485VG_IOT01A
  • K66F
  • K64F

1. Import the application into your desktop

 mbed import https://os.mbed.com/users/Daniel_Lee/code/mbed-os-example-cellular-BG96_os511/

 cd mbed-os-example-cellular-BG96_os511

2. Compile and program

mbed compile -t <toolchain> -m <TARGET_BOARD>

(supported toolchains : GCC_ARM / ARM / IAR)

3. Download binary to a target board

4. Result

mbed-os-example-cellular


Built: Jun  4 2019, 13:45:53


[MAIN], plmn: (null)
Modem power on
Establishing connection
..

Connection Established.
TCP: connected with echo.mbedcloudtesting.com server
TCP: Sent 4 Bytes to echo.mbedcloudtesting.com
...Received from echo server 4 Bytes
...

Success. Exiting

5. Patched code

If need more information such as how to test, please look at https://os.mbed.com/teams/mbed-os-examples/code/mbed-os-example-cellular/.

Diff: main.cpp

Revision:
45:dc095588e1b4
Parent:
34:6f85d44597ac
Child:
46:81a8fcab4a6a
--- a/main.cpp	Tue Jun 04 04:22:34 2019 +0000
+++ b/main.cpp	Tue Jun 04 04:31:21 2019 +0000
@@ -25,6 +25,14 @@
 // Number of retries /
 #define RETRY_COUNT 3
 
+/* Pin configuraiton */
+// Cat.M1 of WIZnet
+#define MBED_CONF_IOTSHIELD_CATM1_RESET             D7
+#define MBED_CONF_IOTSHIELD_CATM1_PWRKEY            D9
+// On-board sensors
+#define MBED_CONF_IOTSHIELD_SENSOR_CDS              A0
+#define MBED_CONF_IOTSHIELD_SENSOR_TEMP             A1
+
 NetworkInterface *iface;
 
 // Echo server hostname
@@ -128,6 +136,26 @@
     return retcode;
 }
 
+ /*
+ * WIZnet's BG96 Modem init
+ */
+void iotshield_modem_init(void)
+{
+    DigitalOut _RESET_IOTSHIELD(MBED_CONF_IOTSHIELD_CATM1_RESET);
+    DigitalOut _PWRKEY_IOTSHIELD(MBED_CONF_IOTSHIELD_CATM1_PWRKEY);
+
+    _RESET_IOTSHIELD = 1;
+    _PWRKEY_IOTSHIELD = 1;
+    wait_ms(300);
+
+    _RESET_IOTSHIELD = 0;
+    _PWRKEY_IOTSHIELD = 0;
+    wait_ms(400);
+
+    _RESET_IOTSHIELD = 1;
+    wait_ms(1000);
+}
+
 /**
  * Opens a UDP or a TCP socket with the given echo server and performs an echo
  * transaction retrieving current.
@@ -212,6 +240,10 @@
     print_function("\n\n[MAIN], plmn: %s\n", MBED_CONF_NSAPI_DEFAULT_CELLULAR_PLMN);
 #endif
 
+    // Cat.M1 module init: Hardware reset and power on
+    print_function("Modem power on\n");
+    iotshield_modem_init();
+
     print_function("Establishing connection\n");
 #if MBED_CONF_MBED_TRACE_ENABLE
     trace_open();