Diff: RF22Mesh.cpp
- Revision:
- 0:e16ffa7cb900
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/RF22Mesh.cpp Mon Jul 02 01:29:58 2012 +0000
@@ -0,0 +1,241 @@
+// RF22Mesh.cpp
+//
+// Define addressed datagram
+//
+// Part of the Arduino RF22 library for operating with HopeRF RF22 compatible transceivers
+// (see http://www.hoperf.com)
+// RF22Datagram will be received only by the addressed node or all nodes within range if the
+// to address is RF22_BROADCAST_ADDRESS
+//
+// Author: Mike McCauley (mikem@open.com.au)
+// Copyright (C) 2011 Mike McCauley
+// $Id: RF22Mesh.cpp,v 1.4 2011/02/15 04:51:59 mikem Exp $
+// ported to mbed by Karl Zweimueller
+
+#include <mbed.h>
+#include <RF22Mesh.h>
+//#include <SPI.h>
+
+
+uint8_t RF22Mesh::_tmpMessage[RF22_ROUTER_MAX_MESSAGE_LEN];
+
+////////////////////////////////////////////////////////////////////
+// Constructors
+RF22Mesh::RF22Mesh(uint8_t thisAddress ,PinName slaveSelectPin , PinName mosi, PinName miso, PinName sclk, PinName interrupt )
+ : RF22Router(thisAddress, slaveSelectPin, mosi, miso, sclk, interrupt )
+{
+}
+
+////////////////////////////////////////////////////////////////////
+// Public methods
+
+////////////////////////////////////////////////////////////////////
+// Discovers a route to the destination (if necessary), sends and
+// waits for delivery to the next hop (but not for delivery to the final destination)
+uint8_t RF22Mesh::sendtoWait(uint8_t* buf, uint8_t len, uint8_t address)
+{
+ if (len > RF22_MESH_MAX_MESSAGE_LEN)
+ return RF22_ROUTER_ERROR_INVALID_LENGTH;
+
+ RoutingTableEntry* route = getRouteTo(address);
+ if (!route && !doArp(address))
+ return RF22_ROUTER_ERROR_NO_ROUTE;
+
+ // Now have a route. Contruct an applicaiotn layer message and dend it via that route
+ MeshApplicationMessage* a = (MeshApplicationMessage*)&_tmpMessage;
+ a->header.msgType = RF22_MESH_MESSAGE_TYPE_APPLICATION;
+ memcpy(a->data, buf, len);
+ return RF22Router::sendtoWait(_tmpMessage, sizeof(RF22Mesh::MeshMessageHeader) + len, address);
+}
+
+////////////////////////////////////////////////////////////////////
+boolean RF22Mesh::doArp(uint8_t address)
+{
+ // Need to discover a route
+ // Broadcast a route discovery message with nothing in it
+ MeshRouteDiscoveryMessage* p = (MeshRouteDiscoveryMessage*)&_tmpMessage;
+ p->header.msgType = RF22_MESH_MESSAGE_TYPE_ROUTE_DISCOVERY_REQUEST;
+ p->destlen = 1;
+ p->dest = address; // Who we are looking for
+ uint8_t error = RF22Router::sendtoWait((uint8_t*)p, sizeof(RF22Mesh::MeshMessageHeader) + 2, RF22_BROADCAST_ADDRESS);
+ if (error != RF22_ROUTER_ERROR_NONE)
+ return false;
+
+ // Wait for a reply, which will be unicast back to us
+ // It will contain the complete route to the destination
+ uint8_t messageLen = sizeof(_tmpMessage);
+ // FIXME: timeout should be configurable
+ Timer t;
+ t.start();
+ unsigned long endtime = t.read_ms() + 4000;
+ while (t.read_ms() < endtime)
+ {
+ if (RF22Router::recvfromAck(_tmpMessage, &messageLen))
+ {
+ if ( messageLen > 1
+ && p->header.msgType == RF22_MESH_MESSAGE_TYPE_ROUTE_DISCOVERY_RESPONSE)
+ {
+ MeshRouteDiscoveryMessage* d = (MeshRouteDiscoveryMessage*)p;
+ // Got a reply, now add the next hop to the dest to the routing table
+ // The first hop taken is the first octet
+ addRouteTo(address, headerFrom());
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+////////////////////////////////////////////////////////////////////
+// Called by RF22Router::recvfromAck whenever a message goes past
+void RF22Mesh::peekAtMessage(RoutedMessage* message, uint8_t messageLen)
+{
+ MeshMessageHeader* m = (MeshMessageHeader*)message->data;
+ if ( messageLen > 1
+ && m->msgType == RF22_MESH_MESSAGE_TYPE_ROUTE_DISCOVERY_RESPONSE)
+ {
+ // This is a unicast RF22_MESH_MESSAGE_TYPE_ROUTE_DISCOVERY_RESPONSE messages
+ // being routed back to the originator here. Want to scrape some routing data out of the response
+ // We can find the routes to all the nodes between here and the responding node
+ MeshRouteDiscoveryMessage* d = (MeshRouteDiscoveryMessage*)message->data;
+ addRouteTo(d->dest, headerFrom());
+ uint8_t numRoutes = messageLen - sizeof(RoutedMessageHeader) - sizeof(MeshMessageHeader) - 2;
+ uint8_t i;
+ // Find us in the list of nodes that were traversed to get to the responding node
+ for (i = 0; i < numRoutes; i++)
+ if (d->route[i] == _thisAddress)
+ break;
+ i++;
+ while (i++ < numRoutes)
+ addRouteTo(d->route[i], headerFrom());
+ }
+ else if ( messageLen > 1
+ && m->msgType == RF22_MESH_MESSAGE_TYPE_ROUTE_FAILURE)
+ {
+ MeshRouteFailureMessage* d = (MeshRouteFailureMessage*)message->data;
+ deleteRouteTo(d->dest);
+ }
+}
+
+////////////////////////////////////////////////////////////////////
+// This is called when a message is to be delivered to the next hop
+uint8_t RF22Mesh::route(RoutedMessage* message, uint8_t messageLen)
+{
+ uint8_t from = headerFrom(); // Might get clobbered during call to superclass route()
+ uint8_t ret = RF22Router::route(message, messageLen);
+ if ( ret == RF22_ROUTER_ERROR_NO_ROUTE
+ || ret == RF22_ROUTER_ERROR_UNABLE_TO_DELIVER)
+ {
+ // Cant deliver to the next hop. Delete the route
+ deleteRouteTo(message->header.dest);
+ if (message->header.source != _thisAddress)
+ {
+ // This is being proxied, so tell the originator about it
+ MeshRouteFailureMessage* p = (MeshRouteFailureMessage*)&_tmpMessage;
+ p->header.msgType = RF22_MESH_MESSAGE_TYPE_ROUTE_FAILURE;
+ p->dest = message->header.dest; // Who you were trying to deliver to
+ // Make sure there is a route back towards whoever sent the original message
+ addRouteTo(message->header.source, from);
+ ret = RF22Router::sendtoWait((uint8_t*)p, sizeof(RF22Mesh::MeshMessageHeader) + 1, message->header.source);
+ }
+ }
+ return ret;
+}
+
+////////////////////////////////////////////////////////////////////
+// Subclasses may want to override
+boolean RF22Mesh::isPhysicalAddress(uint8_t* address, uint8_t addresslen)
+{
+ // Can only handle physical addresses 1 octet long, which is the physical node address
+ return addresslen == 1 && address[0] == _thisAddress;
+}
+
+////////////////////////////////////////////////////////////////////
+boolean RF22Mesh::recvfromAck(uint8_t* buf, uint8_t* len, uint8_t* source, uint8_t* dest, uint8_t* id, uint8_t* flags)
+{
+ uint8_t tmpMessageLen = sizeof(_tmpMessage);
+ uint8_t _source;
+ uint8_t _dest;
+ uint8_t _id;
+ uint8_t _flags;
+ if (RF22Router::recvfromAck(_tmpMessage, &tmpMessageLen, &_source, &_dest, &_id, &_flags))
+ {
+ MeshMessageHeader* p = (MeshMessageHeader*)&_tmpMessage;
+
+ if ( tmpMessageLen >= 1
+ && p->msgType == RF22_MESH_MESSAGE_TYPE_APPLICATION)
+ {
+ MeshApplicationMessage* a = (MeshApplicationMessage*)p;
+ // Handle application layer messages, presumably for our caller
+ if (source) *source = _source;
+ if (dest) *dest = _dest;
+ if (id) *id = _id;
+ if (flags) *flags = _flags;
+ uint8_t msgLen = tmpMessageLen - sizeof(MeshMessageHeader);
+ if (*len > msgLen)
+ *len = msgLen;
+ memcpy(buf, a->data, *len);
+
+ return true;
+ }
+ else if ( _dest == RF22_BROADCAST_ADDRESS
+ && tmpMessageLen > 1
+ && p->msgType == RF22_MESH_MESSAGE_TYPE_ROUTE_DISCOVERY_REQUEST)
+ {
+ MeshRouteDiscoveryMessage* d = (MeshRouteDiscoveryMessage*)p;
+ // Handle Route discovery requests
+ // Message is an array of node addresses the route request has already passed through
+ // If it originally came from us, ignore it
+ if (_source == _thisAddress)
+ return false;
+
+ uint8_t numRoutes = tmpMessageLen - sizeof(MeshMessageHeader) - 2;
+ uint8_t i;
+ // Are we already mentioned?
+ for (i = 0; i < numRoutes; i++)
+ if (d->route[i] == _thisAddress)
+ return false; // Already been through us. Discard
+
+ // Hasnt been past us yet, record routes back to the earlier nodes
+ addRouteTo(_source, headerFrom()); // The originator
+ for (i = 0; i < numRoutes; i++)
+ addRouteTo(d->route[i], headerFrom());
+ if (isPhysicalAddress(&d->dest, d->destlen))
+ {
+ // This route discovery is for us. Unicast the whole route back to the originator
+ // as a RF22_MESH_MESSAGE_TYPE_ROUTE_DISCOVERY_RESPONSE
+ // We are certain to have a route there, becuase we just got it
+ d->header.msgType = RF22_MESH_MESSAGE_TYPE_ROUTE_DISCOVERY_RESPONSE;
+ RF22Router::sendtoWait((uint8_t*)d, tmpMessageLen, _source);
+ }
+ else if (i < _max_hops)
+ {
+ // Its for someone else, rebroadcast it, after adding ourselves to the list
+ d->route[numRoutes] = _thisAddress;
+ tmpMessageLen++;
+ // Have to impersonate the source
+ // REVISIT: if this fails what can we do?
+ RF22Router::sendtoWait(_tmpMessage, tmpMessageLen, RF22_BROADCAST_ADDRESS, _source);
+ }
+ }
+ }
+ return false;
+}
+
+////////////////////////////////////////////////////////////////////
+boolean RF22Mesh::recvfromAckTimeout(uint8_t* buf, uint8_t* len, uint16_t timeout, uint8_t* from, uint8_t* to, uint8_t* id, uint8_t* flags)
+{
+ Timer t;
+
+ t.start();
+ unsigned long endtime = t.read_ms() + timeout;
+ while (t.read_ms() < endtime)
+ {
+ if (recvfromAck(buf, len, from, to, id, flags))
+ return true;
+ }
+ return false;
+}
+
+
+
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