Using I2C to connect Arduinos

i've been working nicholas zambetti's examples i2c master/slave.
i can communicate between 2 arduinos in both directions.
from master arduino, can send multiple bytes slave.

however, can not seem slave send more 1 byte master.
(i can, slave send string of characters master.)

for example, slave code send 1 byte master fine:

code: [select]

void requestevent(){
 wire.send(bvar);
}

this sends string master fine:

code: [select]

void requestevent(){
 wire.send("hello ");
}

but seems can't . . .

code: [select]

void requestevent(){
 wire.send(bvar);
 wire.send(bvar2);
}

am allowed 1 wire.send @ slave when responding request?
or doing wrong?

it seems odd can send string, limited single byte otherwise.

if that's how is, can live - need know.
in general these great examples , seem way go inter-arduino communications. zambetti did great job writing twi , wiring code.

any appreciated. can't seem find on how use wire library in general.
[edit]oops! rtfm! i'm sure answer here:
http://arduino.cc/en/reference/wiresend (quantity param)
sorry flack.
[/edit]

i want able send command slave, wait slave complete command (sometimes 2-3 sec.) , receive response slave command completed.

my question is:
when master makes wire.requestfrom data slave, how long wait response ?

(by checking wire.available() )


btw - in regard previous post, assume you're limited 1 wire.send response request @ slave. (however can send strings , arrays.) if can confirm that, great.

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