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//
// CommunicationProtocol.m
// DUREX Vendor Control
//
// Created by Imanol Barba on 5/23/14.
// Copyright (c) 2014 Emmoco. All rights reserved.
//
#import "CommunicationProtocol.h"
@interface CommunicationProtocol ()
@end
@implementation CommunicationProtocol
+ (id)sharedProtocol {
static CommunicationProtocol *shared = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
shared = [[self alloc] init];
});
return shared;
}
-(Boolean) waitForMessageAvailable: (Boolean) status
{
uint8_t retries = 0;
while([self messageAvailable] != status)
{
[NSThread sleepForTimeInterval:5];
if([self messageAvailable] != status)
{
if(retries++ == MAX_RETRIES)
{
return FALSE;
}
}
}
return TRUE;
}
-(NSString*) readMessage
{
__block uint8_t numPackets, numBytes;
__block NSMutableString *message;
[message setString:@""];
if([self waitForMessageAvailable:TRUE])
{
[[EMConnectionManager sharedManager] readResource:@"numPackets" onSuccess:^(id readValue)
{
numPackets = (uint8_t) [readValue unsignedCharValue];
}
onFail:^(NSError *error)
{
NSLog(@"%@",error);
numPackets = 0;
}];
if(numPackets)
{
for(int i = 0; i < numPackets; i++)
{
[[EMConnectionManager sharedManager] readResource:@"numBytes" onSuccess:^(id readValue)
{
numBytes = (uint8_t) [readValue unsignedCharValue];
}
onFail:^(NSError *error)
{
NSLog(@"%@",error);
numBytes = 0;
}];
if(numBytes)
{
[[EMConnectionManager sharedManager] readResource:@"data" onSuccess:^(id readValue)
{
[message appendString:[readValue stringValue]];
}
onFail:^(NSError *error)
{
NSLog(@"%@",error);
}];
}
}
}
}
[[EMConnectionManager sharedManager] writeValue:@"FALSE" toResource:@"messageAvailable" onSuccess:^
{
}
onFail:^(NSError *error)
{
NSLog(@"%@",error);
}
];
return message;
}
-(Boolean) writeMessage: (NSString*) message
{
unsigned long remainingBytes = [message length];
uint8_t numBytes, current_index = 0;
__block Boolean status = FALSE;
[[EMConnectionManager sharedManager] writeValue:[NSNumber numberWithUnsignedChar:(unsigned char)([message length]/MAX_STRING_LENGTH)+1] toResource:@"numPackets" onSuccess:^
{
status = TRUE;
}
onFail:^(NSError *error)
{
NSLog(@"%@",error);
status = FALSE;
}
];
if(status != FALSE)
{
while(remainingBytes)
{
if(![self waitForMessageAvailable:FALSE])
{
status = FALSE;
break;
}
if(remainingBytes > MAX_STRING_LENGTH)
{
numBytes = MAX_STRING_LENGTH;
remainingBytes -= MAX_STRING_LENGTH;
}
else
{
numBytes = remainingBytes;
remainingBytes = 0;
}
[[EMConnectionManager sharedManager] writeValue:[NSNumber numberWithUnsignedChar:(unsigned char)numBytes] toResource:@"data" onSuccess:^
{
status = TRUE;
}
onFail:^(NSError *error)
{
NSLog(@"%@",error);
status = FALSE;
}
];
if(status != FALSE)
{
NSString *data = [message substringWithRange:NSMakeRange(current_index, numBytes)];
current_index += numBytes;
[[EMConnectionManager sharedManager] writeValue:data toResource:@"data" onSuccess:^
{
status = TRUE;
}
onFail:^(NSError *error)
{
NSLog(@"%@",error);
status = FALSE;
}
];
if(status != FALSE)
{
[[EMConnectionManager sharedManager] writeValue:@"TRUE" toResource:@"messageAvailable" onSuccess:^
{
status = TRUE;
}
onFail:^(NSError *error)
{
NSLog(@"%@",error);
status = FALSE;
}
];
}
}
}
}
return status;
}
-(Boolean) establishConnection
{
if([self writeMessage:@"Hello"])
{
NSString *answer = [self readMessage];
if([answer isEqualToString:@"Hello"])
{
return TRUE;
}
}
return FALSE;
}
@end
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