Update readme.md with fuota server details.

[branek]

As fuota example is more or less working now, some details in readme.md about network/app server setup and configuration for test/poc would be great.

[mluis1]

The fuota-test-01example is primarily meant for the network server providers to test their implementation of the LoRa-Alliance, 3 newly defined application packages.

As for the moment this isn't yet fully finalized I followed the instructions provided on the below project in order to be able to start testing the current implementation on this project.

https://github.com/ARMmbed/mbed-os-example-lorawan-fuota

Please read chapter Testing using LoRaServer.io from README.md.

Please note, that I had to make some modifications to the loraserver.js file in order to make it work.
The changes are shown below.

diff --git a/fuota-server/loraserver.js b/fuota-server/loraserver.js
index 59b07ae..29c3b82 100644
--- a/fuota-server/loraserver.js
+++ b/fuota-server/loraserver.js
@@ -4,7 +4,7 @@
  * Note that this is completely hacked together, and I'd suggest to never
  */
 
-const LORASERVER_HOST = process.env.LORA_HOST || '192.168.122.132';
+const LORASERVER_HOST = process.env.LORA_HOST || 'localhost';
 const PACKET_FILE = process.argv[2];
 const DATARATE = process.env.LORA_DR || 0;
 
@@ -19,18 +19,18 @@ const gpsTime = require('gps-time');
 const fs = require('fs');
 const rp = require('request-promise');
 
-const CLASS_C_WAIT_S = 15;
+const CLASS_C_WAIT_S = 60;
 
 // all devices that you want to update
 const devices = [
-    // '00a99d4921b26d75'
-    '00800000040004c9'
+    '0a5032595f506f59', // - NucleoL476
+    //'3037353159347d04' // - NAMote72
 ];
 
 // details for the multicast group
 const mcDetails = {
     applicationID: '1',
-    devEUI: '00a99d4921b26d76',
+    devEUI: 'ffffffffffffffff',
 };
 
 let classCStarted = false;
@@ -78,7 +78,8 @@ client.on('message', async function (topic, message) {
             console.log('deviceTime', deviceTime, 'serverTime', serverTime);
 
             let adjust = serverTime - deviceTime | 0;
-            let resp = [ 1, adjust & 0xff, (adjust >> 8) & 0xff, (adjust >> 16) & 0xff, (adjust >> 24) & 0xff, 0b0000 /* tokenAns */ ];
+            let token = body[5];
+            let resp = [ 1, adjust & 0xff, (adjust >> 8) & 0xff, (adjust >> 16) & 0xff, (adjust >> 24) & 0xff, token & 0x0F ];
 
             let responseMessage = {
                 "reference": "jan" + Date.now(),
@@ -159,7 +160,7 @@ client.on('message', async function (topic, message) {
         }
         else if (body[0] === 0x5) { // DATA_BLOCK_AUTH_REQ
             let hash = '';
-            for (let ix = 5; ix > 1; ix--) {
+            for (let ix = 5; ix > 0; ix--) {
                 hash += body.slice(ix, ix+1).toString('hex');
             }
             console.log('Received DATA_BLOCK_AUTH_REQ', m.devEUI, hash);
@@ -245,7 +246,7 @@ function sendMcClassCSessionReq() {
 
         setTimeout(() => {
             startSendingClassCPackets();
-        }, (CLASS_C_WAIT_S + 10) * 1000); // because the delta drift that we don't know (see above)
+        }, (CLASS_C_WAIT_S + 20) * 1000); // because the delta drift that we don't know (see above)
     }
 
     let msg = {
@@ -315,7 +316,7 @@ async function startSendingClassCPackets() {
 
         console.log('Sent packet', ++counter);
 
-        await sleep(2200); // tpacket on SF12 is 2100 ms. so this should just work (although loraserver doesn't think it's a problem to send faster)
+        await sleep(4000); // tpacket on SF12 is 2100 ms. so this should just work (although loraserver doesn't think it's a problem to send faster)
     }
 
     console.log('Done sending all packets');

[branek]

Thank you, I was also working on same example. Your changes are very helpful.