MQTT client to test the ENC28J60-EMAC on NUCLEO-L152RE

Dependencies:   ENC28J60-EMAC

Revision:
0:238f0d0c0ba3
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+++ b/README.md	Fri Mar 26 16:15:14 2021 +0000
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+# mbed OS Ethernet MAC (EMAC) driver for the ENC28J60 Ethernet controller
+  and modules equipped with such chip.
+
+This is a fork (simplified version) of the ENC28J60-EMAC driver published by Tobias Jaster at
+
+https://github.com/tobiasjaster/ENC28J60-EMAC-Driver
+
+Usage:
+
+1.  Connect the ENC28J60 module to the Mbed board as follows:
+
+
+    -------------      SPI interface     --------------
+                 |                      |
+            MOSI |----------------------| MOSI
+                 |                      |
+            MISO |----------------------| MISO
+    Mbed         |                      |       ENC28J60
+    board   SCK  |----------------------| SCK   module
+                 |                      |
+            CS   |----------------------| CS
+                 |                      |
+            GND  |----------------------| GND
+                 |                      |
+    -------------                        --------------
+ 
+2.  Import (add) this ENC28J60-EMAC library to your program.
+
+3.  Add a "mbed_app.json" file with the following content 
+    to the root directory of your program:
+   
+    {
+        "target_overrides": {
+            "*": {
+                "platform.callback-nontrivial": true,
+                "enc28j60-emac.mosi":  "D11",
+                "enc28j60-emac.miso":  "D12",
+                "enc28j60-emac.sck" :  "D13",
+                "enc28j60-emac.cs"  :  "D10"
+            }
+        }
+    }
+
+   Replace "D11", ..., "D10" with the actual pin names you have selected on the Mbed board 
+   to be used for the SPI communication.
+   
+4. To set the MAC address define an array with the desired address bytes and
+   call the "set_hwaddr(mac)" function before calling the network interface "connect" function.
+   
+   For example:
+   
+    const uint8_t       MAC[6] = { 0, 1, 2, 3, 4, 5 };
+    EthernetInterface   net;
+   
+    int main()
+    {
+        net.get_emac().set_hwaddr(MAC);             // set MAC address
+        if (net.connect() != 0) {
+            printf("Error: Unable to connect to the network.\n");
+            return -1;
+        }
+   
+        ...
+